There is quite a difference between “bleeding edge” or “rolling release” kernels, though, and what Ubuntu offers with the HWE kernel.
Unless I’m misunderstanding, the current Ubuntu HWE kernel is based on 6.2, while the most recently released “stable” kernel is 6.6. Without significant manual intervention, I’d feel fairly confident saying no Ubuntu user is going to get pushed a “just-released”, untested kernel. Not to say there still can’t be issues introduced (as someone with an AMD processor and an fTPM chip that was never patched by the manufacturer, I experienced the fun of all that mess), but ultimately I’d think it’s a worse experience if the average user can’t pick up a 1-year-old machine and have the core components work “out of the box” - and that’s a real risk with kernels that are as old as 5.15 is now.