Prusa was all in on open source for over a decade. All their machines up through the MK3S+ are GPL hardware, firmware and software. What did that get them as a company? A lot of people selling near identical copies of their hardware for lower prices. Prusa's leaning away from open source hardware because it pretty much meant doing their competitors' R&D for them. Hell, Bambu Labs relies on code developed at Prusa Research. So their ecosystem is closing up somewhat.

You are right, a big strength of Prusa's is their mod ecosystem, their community. They are well aware of this, which is why they've come out with their OCL license. The Core One isn't GPL, it's OCL, source-available. It's illegal for anyone to start making blatant copies, but the CAD files are there for reference when making mods and accessories.

Prusa's MMU3 is in several ways superior to Bambu's AMS: you get 5 spools, not 4. Retract-based tool changes are faster than purge-based ones. Retract-based tool changes are less wasteful than purge-based ones; Prusas don't poop. And yet, Bambu finished the AMS, Prusa merely got the MMU3 working. Installing an MMU3 requires a fairly invasive modification to the Nextruder and a desk full of tubes and nonsense. I think Prusa's going to catch up there with the INDX system with the MMU3 as basically a legacy product.

The market for "kinda polished, easy DIY 3d printing" is small and shrinking. I know because I'm in it, and us kit builders are small potatoes to them. Prusa is trying to position themselves in the professional and industrial sector; they're releasing a "Pro" line of turnkey print farm and industrial solutions, they sell tungsten fill radiation shield filament and certified encrypted USB drives. I believe they are working on a self-hostable version of PrusaConnect, likely aimed at their higher end customers who are more likely to balk at using anyone's cloud service. To that market, "We're not Chinese" is Prusa's biggest selling point.