How is this different from room design?
In these rooms the layout defines the work itself: a fridge behind the wall lands in the podcast track, a desk between people reads as a barrier in a therapy room, and south light misleads colour in an art studio.
What does home recording need?
Acoustics and silence first, gear second: first-reflection treatment, a rug and curtains, background noise below about 30 dBA.
Is privacy handled in a practice room?
Yes: a sealed door, no through traffic, masking sound in the waiting area, the client seated nearer the exit and separated entry and exit routes.