Canon already has an EF 24mm f/2.8 IS USM Full Frame lens.
Canon already has an EF-M 22mm f/2 STM lens for their Mirrorless APS-C camera.
Wouldn't it make more sense to make an EF-S 22mm f/2 STM
for their non-mirrorless APS-C cameras.
BTW 24mm = 38mm FF and 22mm = 35mm FF
An EF-S 22mm f/2 STM lens would be a good reason to replace my heavy
EF-S 10-22mm f/3.5-4.5 USM with a light
EF-S 10-18mm f/4.5-5.6 IS STM