> MacBooks are basically the only laptops with a large enough touchpad to be comfortable
This is surprisingly tough to google, but apparently at least some Apple laptop touchpads are 13cm wide, and my Framework 13" touchpad is 11.5x7.66cm (and making it any taller would increase the size of the whole chassis).
Just measured a stand-alone, a 2020-era macbook pro 13” and a M1 Air. The pro and stand-alone are 13cm and the air is 12cm wide. For depth, the stand-alone is closer to square though at 11cm while the laptops both seem to be around 8cm or so.