I'd like to have some of what all the "internal zoom" people are smoking... I have never heard *one* complaint about the 24-70 extending. I've never heard one complaint about the 100-400mm extending. I dropped $2500 on the RF 70-200 the week I got the R5 and I've never regretted that for a moment. My EF 70-200 feels like an absolute dinosaur, and once you use the RF glass, you wonder why anyone ever thought having internal zoom was a good idea. I can throw my RF 70-200 attached to the R5 in a *tiny* shoulder bag that wouldn't even fit the EF lens unattached. 70-200 lenses are not "big glass," they're daily workhorses, and there's no reason they should be any bigger than the 24-70.
It's the same thing we deal with in the fire service with people opposing safety improvements like safer helmets "because that's not how we've always done it." If 70-200 lenses were external zoom from the start, not a soul would be asking for someone to make it an internal zoom lens.
While I'm on my soapbox, I'll add that I laugh every time people say that the F/4 version is worse because it doesn't have a tripod ring... Uhh...Is the 24-104 F/4L worse off because it doesn't have a tripod ring? The RF 70-200 F/4 is no bigger than the RF 24-105. It doesn't need a tripod ring