I'm following this thread with great interest since
we're blessed to have a large open room in which to record. It seems like this thread has a lot of people's opinions, preferences and experience rather than equations and facts so I'll add mine to "the mix".
Back in my college days there were two things that determined how "good" a sound system was; how many watts it had and how much it cost. It seemed to me even back then that the room and speaker placement made more of a difference than anything else. It's undeniable that the room has a huge influence on the sound. What you do with that depends on what you're after. I find it ironic that given a large room people hunt to find ways to make it small and at the other end of the spectrum you've got folks using effects like reverb and chorus to make it sound big
We have a grand piano which sounds fantastic in the setting that it's in. Reproducing that sound on a recording is another matter. Having the top open and aiming a mic at the lid from a few feet away has worked. So has close micing the sound board with a stereo pair. Change the mics or orient them slightly different and it sounds like you're under water. Having a large room makes recording more difficult only in the sense that you've got so many more possibilities to work with.
My son was selected to sing in the All State choir last year. 300 talented kids and a fantastic director. The practice room was maybe 40x100 feet with a 12 foot ceiling. They sounded great but where you were standing around the periphery changed the sound completely. Want to turn up the bass, move singers left.

Unfortunately the performance hall was the Yakima Sun Dome. A concrete cavern better suited for indoor rodeos. The sound sitting up in the stands was a disappointment to say the least. Of course being proud parents we coughed up the obligatory $20 or so to buy the CD even though I was sure it would have the quality of a tin can and string arrangement. To my amazement the CD sounded great. None of the rattle and hum from the HVAC system, no echo echo echo, and the various sections of the choir were even in balance. I don't know how they did it but I guess sometimes even the pros get it right