Now these errors are for the most part irrelevant in most applications, because food for example is still very edible and nutritious even if it is not absolutely 100% as good as the original, same goes for most spare ship parts and such.

Star Trek's replicators also modify the food, which may matter more than small-scale errors. They specifically create a copy of the food that is deliberately nutritionally tailored for your specific dietary needs, and to remove poisonous substances within it.

Those errors tend to be more of a problem for big complex molecules like DNA, or sophisticated things like computer chips.

All that is true for fabricated things using current technology.

Everything they can produce stems from an original object that was molecularly scanned and programmed into the replicator. They cant just make whatever out of nowhere, and they introduce miniscule errors and imperfections each time. Like making a photocopy.

At the risk of being long winded, there's absolutely no reason that, given a technology which literally spins most forms of matter into existence from pure energy, that you would need, or even want, to start with a scan of some physical object. If you wanted to replicate some sort of piece of artwork, sure. but even then, you're not just "making a copy" of something. Consdier the martini. if you didn't add to that, then there's a solid chance that the martini is going everywhere because you're replicating the liquids at the same time as the glass.

you would either have to add some kind of containment field to keep the liquid in place while the glass is also built up, or more simply, just replicate the glassware first (or at least the surface holding the booze).

Even then, chances are, the martini is set up to be parametric. what if they only wanted one olive? or three? what if they wanted a different kind of gin? or shaken, not stirred. Maybe they didn't want mixed over ice at all, but chilled to a very cold temperature? what if they wanted it room temperature? or slightly warmed? (okay, that's gross.)

but getting back to the 'no need to scan anything'. if you know what's in the materials making it- lets say you want a steel i-beam, of a certain size- then you could simply define the material, procedural generate an iron alloy with x% carbon and whatever other materials to produce the perfect steel.

And here's the neat thing: that steel i-beam would have fewer flaws any "traditionally" made i-beam ever would, because it's synthetic. any of the flaws would be on the molecular or probably atomic level, with a perfect diffusion of the alloyed materials, and crystal structure and everything else. You could, presumably, even, use impurities intentionally so as to create weak points so that the I-beam fails in a known and predictable manner.

You can see the design flow for creating stuff using a replicator in Voyager, that episode with Naomi and Flotter, where harry is designing a stuffie at neelix's behest. That's how it's done. Harry didn't start with a stuffy he scanned in. It was literally like vibe coding, but with design files. (this is probably why he never got promoted. he was a Vibe, uh, engineer.)

It's not replicating unless you're telling it to make a copy of something that already exists

It is though. The replicator stores static patterns in a similar way to the transporter - they're basically the same technology. To create a new replicator pattern (e.g. a cup of tea) the original cup of tea is dematerialized and the pattern saved for future reproduction. This also explains why some people complain about eating "the same replicated meal" over and over - it's literally true, the replicator replicates the exact same cut of chicken cooked the exact same way with the exact same spice blend every time, because it's reproducing a copy from a file. Even if it's a perfect chicken dinner, it's the same one you've had hundreds of times before.

This also explains why every replicator in the universe can't just reproduce anything at any time. Different models have different sets of patterns available. A restaurant-grade model (like Quark's) might be distributed with a menu of meals prepared by chefs with good reputation and have more space dedicated for storing food patterns, whereas the Starfleet model has a menu prepared by a committee of Starfleet nutritionists (decent, healthy, but not gourmet) and also uses some pattern storage for utility items like uniforms and tricorders &etc (it's general-purpose, not specialized for food, so its food reproduction is comparatively lower quality than Quark's).

Presumably the patterns are not easily interchangeable/distributable - different file formats, different scanner resolution, maybe different output options (canonically some materials are more difficult to replicate than others, so might require a specialized replicator). Quark's replicator, being Ferengi, is probably proprietary and requires purchasing new patterns only from the original manufacturer to increase the variety.

I mean, Like I said. in-universe, I just assume it was named by politicians (or bad admirals, if you prefer.)

And yeah. Another one that bugs me? Neutronium.

Outside of a neutron star’s gravity, it becomes, uhm. How shall we put this? One of the most explosive things we can conceive of IRL.

Probably a good thing Wesley didn’t try to play with a block.

Marketing department named those, I'm sure.