This is particularly obnoxious when most (if not all) modern economy vehicles have blind spot warning lights in the side view mirrors and yet the best my 3 can do is really janky live camera feeds and a solid red line on the highway visualization - both of which feel very unreliable and also require you to divert your attention to the screen (which is damn dangerous if you’re merging left but have to look right to see the screen).
I just treat my Tesla like a car from the 90s and always do the standard “sideview mirror into the over the shoulder” glance whenever I’m changing lanes.