I don’t see how those problems are related. Finally replacing those dozen terrible USB port variants with a single good design is great, and solves problem (3)

I don’t see how those problems are related. Finally replacing those dozen terrible USB port variants with a single good design is great, and solves problem (3). You’d finally only need one type of cable. Routing all kinds of other protocols through that same port creates problem (2), and introduces a completely new kind of cable fragmentation. I think that’s orthogonal.