You didn't address my point about transformers.
Either way, I have to disagree with you on these comments as well except for the multi-channel part.
I use a REL S/2 sub connected via high level to an 2 ch amp that does not have a sub-out. It is one of the best sub integrations for music I have ever heard. I am also big into streaming - FLAC 44/16 and now up to 24/196 with MQA or hi-res. I don't want or need an amp that streams since I prefer using an external device.