That C was certainly a major step backwards at the time, only adopted thanks to AT&T being forbiden to sell UNIX, thus deciding to offer the source code for a nominal fee to anyone that wanted to get a license to the source code.
Or to use a more modern example, UNIX was the browser and C was JavaScript.
I never coded in the languages from your earlier post; I'd never have wanted to either. C was and is elegant and beautiful. It isn't so popular because of a AT&T. Look at Microsoft's power in the business world. Even with all their "practices", .Net still hasn't been beaten by Java in terms of popularity and widespread use. .Net is good, not saying it isn't, just so that's clear.
Yeah, more than 200 elegant and beautiful documented cases of UB on ANSI C11 standard.