I ignore the yellow triangle. It relates to the driver aid system (lane assist, speed control, speed warning, etc) and is not a fault nor anything to do with the functionality of the actual car.
For the record, I’ve had mine for 6 months now and not had a single issue. It has its idiosyncrasies for sure, but so do most cars. However, it’s super comfortable, huge inside (although the boot is tiny), reasonably quiet and not too juicy for a car of its size. Is it as good as my previous cars, (Sportage, Tiguan R-Line), no. Would I get another one because it has a couple of things that I find really irritating.
But am I happy with it? Yes. Is it a bargain on the system, absolutely.
Current car: Mini Countryman EV in very shiny black!
Previous car: MG HS Exclusive in nice shiny black.