I was thinking the same earlier this week. Tesla actually provide instructions how to correctly align the Model Y headlights against a wall including the measurements.Standard dipped beam alignment would be so much easier if we could do it "live". In normal operation in Europe, headlights must have a 1% downward angle; annoyingly, you must calibrate a Tesla at a 0% dip. Add to this the pattern isn't the same as the live dipped beam and is instead a dedicated shape that would align with markings on a wall/board.
I think I've found a reasonable compromise at the moment on my car, though I can't help but feel the new adaptive pattern very, very slightly strayed towards the car ahead's driver's mirror, and so the right headlight unit might need a small bump to the right.
When I can find a flat car park and wall (probably a multi-storey will be best), I will give it a try: Model Y Service Manual | Tesla
Having got my headlights to what I feel is a reasonable set up, I will take the measurements first (so I can restore if necessary) and will then follow Tesla's instructions from the Service Manual.