Trends seem to come and go, not long ago everyone wanted an over lap in their focal ranges, ef 16-35 / 24-70 / 70-200 @ f2.8 seems to be wisdom of the "holy trinity". Then the f4 range came along and we got the 16-35, 24-105. but Canon chose to drop a curious 70-200mm f4 (a great lens) into the linage, where a 100-300/f4 would have seemed more logical. These days, Canon have released a 24-105/2.8 and a 100-300/2.8 (although slightly different classes of lens). Leaving the sub 24mm 2.8 UWA zoom available still available.
A lot of photographers like an over lap in the focal ranges, others like the (almost OCD) coverage...where one lens ends, the next one begins. Others seem quite happy to have gaps in their range. Personally, my current walkabouts trinity is my ef 11-24 f4 L, ef 24-70 f2.8L and ef 100-400 f5.6 II L. I have a gap between 70mm and 100mm. it's slightly worse than those fogures suggest because my 100-400 is closer to 110mm at the wide end and my 24-70 is closer to 60mm at the long end (depending on focus breathing). But I've rarely needed the 70-100mm because I usually can walk - zoom.
I think Canon will want to plug the new f4 gap with a 50-XXX f4 lens, they seem to like their trinity groupings. However, yes you are right the RF70-200 f4 LIS is a fine optic and plugs that gap more than adequately.