This won't work for me because I want the AVP to serve as a signal source for a projector, but I get, that this is not a common scenario.
If I had a TV, then another issue might be playing Blu-Ray audio discs. Atmos reissues of some classic albums are the primary reason I'm considering going for multichannel audio in the first place. Sure, you can attach the Blu-Ray to the AVP, the PS5 to the TV, but at $4k I really wouldn't want something that will require switching sources on two devices, especially if I'm not the only user of such a setup.
I would really like to know what's the cost for the manufacturer for going to 48 Gbps. There's already HDMI 2.2 with 96 Gbps bandwidth.