But here is the thing, with most homes, at least in North America, you won't get infinite baffle, there are studs and beams.
And the resonance control is probably terrible with dry wall, maybe in some other regions of the world where the wall are concrete you have better resonance control, but I suspect not many would want to drill a hole through concrete to install in-wall/in-ceiling speakers.
My feeling is that the whole idea of in-wall and in-ceiling speakers is more catered to professional settings or if in private settings, the architecture and space is prioritized before sound quality.