Dunno…. If set up right 7.4.4 is pretty seamless. I think your 8805 maxed would be plenty. I “matrixed” channels for a pool install for coverage and can say paralleling channels works pretty well. Great in fact. Might be an option with your extra roughins.

I dont think its a bad idea to hit high channel counts for object based audio, but why wouldnt you go with a pro cinema solution at that point? Price?

I dont dislike emotiva, but I definitely see them as treating their customer base as voluntary beta testers. Seems like most fans of the brand are Ok with this however, as their products eventually work.