I don't think that's the biggest reason to upgrade to a new major (or even minor) version, especially when the previous release(s) are still supported for quite some time.

Catalina, macOS 10.15, for example, didn't stop being supported when Bug Sur, 11.0, was released. In fact, it will still be supported for quite some time. Mojave, 10.14, is supported until late next year and, High Sierra, 10.13, is still supported even today!

Unless there's some new feature that you absolutely just must have, there just really isn't any compelling enough reason for most folks to immediately upgrade to a new .0 release.

In the Windows world, the conventional wisdom -- for probably a decade and a half! -- has been to wait until after SP1 to move to a new major version.

Maybe the younger generation just hasn't been burned (bad) enough (yet) for them to learn not to touch the stove?