They're also completely missing the point of distro kernel trees. Stable automatically selects patches from mainline (largely by keyword, and often without kernel developer feedback or involvement) and consequently has a massive amount of code churn and very little validation beyond shipping releases and waiting for regression reports. Distro trees are the buffer where actual testing happens before release. As a long term stable user it really isn't suitable for end user or enterprise consumption unless you have your own in house validation process to test releases for regressions before deployment. Even running stable on client machines (desktops, laptops) leads to a bad time every few weeks when something sneaks in that breaks functionality.

Rolling-release Linux distros such as Arch, Gentoo, and OpenSUSE Tumbleweed constantly release the latest updates, but they’re not used in businesses.

So some businesses decided that monolithic releases were more important than being able to get the latest upstream vanilla kernel version, and somehow that's the fault of "all Linux kernel vendors" (including rolling-release distros, since there was no attempt to qualify "all") and not the businesses' decisions about tradeoffs?