Some Tesla owners still have free supercharging so they'll be there because it's free "fuel".

For your road trip example let's say we take a 1000 mile trip. With an EV that can be done in 6 legs (sandbagging it), maybe even 5 or 4 now. So that's 5 stops, over 16 or so hours of driving. If you average charge takes 30 minutes (sandbagging it) instead of 10, that adds 1 hour and 40 minutes or about 15% of total time. And this is pretty much worst case.

I would think that's perfectly acceptable, but that's just an opinion. It'll give you time to go to the bathroom, stretch your legs, have a bite etcetera. If you're going to be peeing in a bottle and eating while driving, yes you can do it in less time.

I would strongly suggest, the next time you do one of those trips. Time how long you actually spend at a stop, it might not be far off the 15 minute mark on average