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Bigger coolers are not a good selling point, can droop the card without support to hold them up
A high end gpu as you say cries out for water cooling if you are that way inclined not a massive cooler.
Easily replaced but not easily with an original fan
you seem to be forgetting airflow too
if a fan breaks on a GPU cooler how do you replace it with a matching fan ? Its not easy or cheap unless you go fugly and strap one on.
Except EVGA have started doing crazy logo molding on the blades and Asus use bespoke fans on their top models (I think).
can you imagine the sag on a big 3/4 slot cooler more than they do already.