[the_why_of_y]

There isn't really an equivalent of Tumbleweed in the RH ecosystem.

CentOS Stream maintains various API and ABI stability guarantees whereas openSUSE Tumbleweed just upgrades you to the latest version regardless, once it has been tested in Factory a bit.

And only one half of Leap is comparable to SLE (because it literally is SLE), the other half is rebuilt from Factory; it's like RHEL + everything that doesn't exist in RHEL from Fedora.

I think it's good that everybody is trying slightly different approaches, keeps things more interesting.