Ok but the front element is always the same or bigger than the entrance pupil so any weight or size savings would be modest and probably not worth making separate RF-s super telephotos.naaa if u want to be really picky - "f/4" doesn't refer to the size of the front element. The F Number refers to the entrance pupil (effective aperture) which is >not< the front element (but could be extremely close in a lot of cases, especially on tele lenses). Just take a look at the Ef 35 f/2 for example - the front element is way bigger than 17.5mm.
Sorry if there was some misunderstanding - of course the difference wouldn't be enormous but still - there would be some. Just compare entry level (no heavy metal L of course) ef lenses with nearly identical ef-s lenses.
I think some RF-s wide angles would be worthwhile though for example 28mm f/2.8 pancake lens
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