As someone that has driven thousands of miles, and encountered some interesting roundabouts and junctions - I cannot relate to your experience whatsoever.
"I just didn't want it acting like an asshole on the road and didn't trust it enough to let the situation play out by itself."
So basically you had to intervene and it doesnt meet the standard of a fully autonomous vehicle. Do all the mental gymnastics all you want mate lmao.
Your experience must be very different. I've been on the road long enough to know that humans will try all sorts of things to not avoid missing the turn & Tesla behaved very similarly.
FWIW, it was signalling all the right ways and no collision seemed imminent and I doubt it would have gotten into an accident. I just didn't want it acting like an asshole on the road and didn't trust it enough to let the situation play out by itself.