I thought about that. But the bookshelf/studio monitors which are good are very big (also expensive) and I would have to have a DAC/Interface to make it work properly. The speakers I'm going to use are the Sonos Architectural in-wall, so it doesn't take any space on my desk while also sound good.For the price of that piece of gear, wouldn't it be a better idea to instead buy a dedicated pair of desktop / bookshelf 2.0 speaker just for the Mac? Or even go up to studio monitors.
(IIRC there is no realistic way to output HDMI ARC out of a Mac without hardwiring somewhere.)
I'm not a media creator, nor audiophile, but I enjoy good sound. The fact that I can put Sonos Sub with AMP later (or even add another AMP with 2 surround speakers) is something that drives me to this approach. Also, Sonos would allow me to use those as the environment speakers as well so if I'm not working on the computer I can use it as any other regular Sonos Room apeakers.
Originally I have planned to use 2 HomePod v2. But after I saw tons of reports saying it sucks as main Mac speaker due to the delay, I gave up.