They aren't, though. Supercharging is an order of magnitude slower than filling up a tank, and most of the time you're charging overnight. These are non-trivial differences to people who, say, rely on on-street parking for their vehicle. Ditto if you run out of juice (no jerrycan equivalent), or need to get something serviced (mechanics for BEVs are still rarer).
The two are effectively equivalent most of the time, but there are some non-trivial differences that conveniently get glossed over. 20% of first time BEV purchasers sell their car and go back to an ICEV, so it's probably important to be honest about the distinction.