That's not what you want for acoustics...
You're thinking of sound dampening.
Like acoustics make things sound good, it's honestly really complicated and hard to get right.
Having shit everywhere prevents noise from bouncing off things.
The confusion is probably because recording booths are sound dampened. That's not to make the record sound better, it's to isolate everything else so that the mix can be clean and prevent echos.
A good echo is literally what people stereotypically look for to gauge the acoustics of a space.