Probably mostly a 'dont need to'. CCS is annoying- you need the apps and/or to swipe a card, there is no integration in the GPS, etc.
The Supercharger is like EZpass for charging - you just plug it in -they bill you later.
Totally agree that for some reason, the most common thread among CCS charging companies is their inability to make it easy to use their chargers. I have a lot of complaints about Tesla, but the charging experience they've developed is not one of them.
Unfortunately, I have a suspicion that once NACS becomes the standard, all the current CCS companies will simply port their terrible user experience over to NACS rather than having the current experience be standard.