my somewhat limited experience (four different types of rims) with tubeless is that the rims which are explicitly and recently designed for tubeless are a lot easier, and even more so when paired with recently designed tires designed specifically to be tubeless. i’m a reasonably strong guy, and found it totally impossible to mount reneherse 42mm knobbies on my DT Swiss R470 rims. like not even close.
GP5000 Pre-tubeless on those rims, possible, but very very hard.
GP 5000 TL S (the most recent ones) and the alpinist II (redesigned for tubeless, allegedly) rims on my
specialized not electric road bike, those I can get on with my bare hands. no soapy water no tire irons just the “make space“ technique combined with the “rolling palms” technique.