As an American, I will say we have very few roundabouts in the US. I live in the SF Bay Area and have only resided in the West Coast (California and Washington state) but have traveled to numerous US states, driving in/thru some of them.
I think I encountered some in Sacramento, CA and recall some in the Seattle area (I lived in that area for about 9 years).
I'm simply not accustomed to them and find them awkward if I stumble across one (almost never), esp. if I'm in a totally unfamiliar area and trying to follow directions from the nav app I have up (I have no Tesla) which would likely be either Apple Maps or Waze via CarPlay. I've had a driver's license for ~30 years now.
Looks like from that map, my city of almost 1 million people has maybe 7 traffic circles. I see one in an adjacent city that's in a shopping mall. That one I can remember but it's in a parking lot and thus people would be driving slowly.
Roundabouts or not, +1 from me in it feeling like it's a bad idea to get rid of the stalks. I've never driven a car w/o a turn signal stalk. Shifter could be in many different places. Wiper controls on older cars American cars tended to vary (e.g. control on the left side of dash or crammed into turn signal (left) stalk). I'm most used to the Japanese car style in the US which is a wiper stalk on the right side.
There are MANY parts of California I've not been to and it seems CA's land area is about 163K square miles vs. the UK's 94K square miles. I've drive as far south as San Diego and as far north as thru CA's northern border into Oregon.