That sounds like it wasn't superfluous, because it convinced s major holdout to change, no?

Well I did say "somewhat superfluous", not "entirely superfluous" :-)

This is where the up- and down-sides need to be considered. Everyone moved from micro-USB to USB-3 because it was easier and better, and this will now be harder (not impossible, as another comment says, this is supposed to be evaluated 5 years). There may also be special cases where there's a good reason to use something other than USB-C Is that a big problem? Maybe not? I don't know.