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Somewhere in early 2000s, vertical resolutions for all laptops magically got locked to 768 lines and most users neither noticed or cared.

I think it was during the second half of the '00 decade actually. I remember 1050 vertical being popular at least until 2007.

Correct. Many Thinkpads had 1050 and 1200 until 2007 or so. It went downhill from there.