Some software isn't yet optimized. For example, if you go full screen with Bluesky or Teams it just makes all the lettering bigger. Signal is great: just like the desktop version. It doesn't seem like a particularly difficult problems to solve for most developers, and normal stuff like Safari and FF work just fine.

And the thing is, if you are going to be typing for a long time, you should probably stick to the smaller screen anyway (although the split keyboard feature in full screen is quite handy).

I do enjoy it, cannot stop fussing with it and tweaking settings, lots of hidden stuff to find. My old iPhone feels practically non-ergonomic now when I pick it up!

One somewhat downside: the expensive kick stand case is great (flips open easily to show the small screen), but it adds significant bulk to an otherwise super trim phone. But, if you are paying laptop prices for a phone, you probably want the protection in most circumstances (I would leave the case at home if I were wearing a suit, for example.)