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A few years ago, as someone who has worked on physics engines for robotics simulations, I would have agreed with you but now a lot of people are doing greenfield physics engines for games and having it work out pretty well. There's a ton of established literature in the area now and it's not nearly as scary as it used to be.
For example, Horizon: Forbidden West uses a custom physics engine that started out as one of the core dev's fun side projects: https://github.com/jrouwe/JoltPhysics
Physics engines (at least game quality physics engines) are starting to drift in to "solved problem" territory and there's enough literature now that you can get something reasonable going yourself after doing some weekend reading.
One of the benefits of 4.0 is also the modularity of it with GDExtension. The major parts of the engine (including the physics) can be swapped with replacements without the need to recompile the entire engine. I'd usually say that is a long shot for community run projects, but even Bevy engine has community made extensions for separate physics engines.
https://bevyengine.org/assets/#physics
Forgetting about extensions, though, I see your point and almost agree, but Godot has shown that they will put in the work to improve their project, even if that means removing features like they did with visual scripting. Their physics engine will definitely be rough at first, but based on their past work, I believe they are willing and able to maintain it.
I hope to be the one to post LÖVE 12 when its out. LÖVE is a far superior game engine in every way! https://love2d.org/
We're working on those, but at some point Godot Engine 4.0 needs to ship..
* https://github.com/godotengine/godot-proposals/issues/4435 (spatial audio)