Correct 3s and now Ys are the same, been this way since the first Model 3s rolled off the line.If I recall correctly on my X, you can adjust the reverse position to be any where you want either mirror to be. Just adjust them while in reverse. It’s a “reverse profile”. Not sure Model 3 is the same. I kind of figured it out by accident.
And back on-topic, indeed it looks like auto-dimming is going bye bye. Must simply be cheaper to manufacture and wire these up... next perhaps no more rear view mirror auto dim.