There are two basic issues in rooms: absorption and reflection.A room is not a passive set of walls where we put reflecting or absorbing surfaces sorry... Save for sellers of acoustics panels publicity...You even forgot the diffusive surfaces...
A room is a living animal resembling to a violin when a musician plays it...Any room speak his own language translated for human ears in a universal meaning by acoustic....
I cannot go further because i will type too much words.... Some people hate me already for my long posts and too numerous posts.... 😁
My metaphor is so right and good i will stay with it at the risk of being completely not understood...
I go back to music anyway....
Chopin Mazurkas by Jakob Flier....