Additional anecdotal data point to add to the conversation - I rarely see Model 3s at the UK Superchargers I've been to. I also have driven to Amsterdam and Frankfurt recently and, with the exception of Germany, I didn't see more than one 3 charging at all! Plenty of S and X though.
Well there you go - drove through France, Belgium and Luxembourg a couple of weeks ago. Stopped at every supercharger along the way just to check them out, 8 I think.....all working fine.....all with lots of M3's (mainly midnight silver) the odd X and and lots of S. Asked at 5 of them why my charge speed was greater than theirs.