So I know that up to PC Engine, 32x, Playstaion 1, etc emulation is mostly solved and is now racing down the accuracy path, but how is the eco system beyond tha

So I know that up to PC Engine, 32x, Playstaion 1, etc emulation is mostly solved and is now racing down the accuracy path, but how is the eco system beyond that? The article mentions N64 and PSP on a Pi4, but is there a good summary somewhere of what to expect at different levels of hardware and how good the emulators are (variety of games vs unexpected bugs), etc?