I think it's a bad look to not even bother incorporating a control ring into it. I'm fine with the decision to re-use the optics, as they really didn't need updating, but it basically being a mount swap (and then making the whole extension silver looks awful) is a bad look. At least offer some mild exterior redesign, with the consistent mount end like every other RF lens, and add a control ring. Right now, this is less functional than the EF version with the control ring adapter.
I totally agree! That silver "glued on" extension tube looks cheap and ugly. And these lenses are the only RF lenses without a control ring, even the $100 50mm STM has one.
Canon probably considered these lenses too cheap to have a control ring.