[greggsy]

Room treatments are technically straight forward, but they come at a cost of interior design and practicality. Many people see it as but if a dark art too, so they’ll take a technical implementation any day because it has been designed to accomodate a wide range of scenarios, and takes the guesswork out.

[Sebb767]

Placing 5/7/11/n speakers plus a number of subwoofers also comes at the cost of interior design and practicality ;) It's just (usually) easier to do than proper soundproofing and easier to adapt to non-optimal room designs.