I see. That’s different from composability indeed. I have a crazy take for that. There should be a permissionless plugins system to extend apps. Most probable candidate is some kind of WASM or hardened JS like in MetaMask Snaps. Might look like Figma plug-ins.Technically I see no problem to make it real.
The major question for me is if you build that kind of (universal) plugin system, so that devs do not re-implement it every time, how would you capture value.
Agree, technically it is possible, I guess there are going to be many different takes on that, further choices would be if that's some kind of library or opinionated framework/world. You should checkout what Lattice is doing, I love their approach.