To be clear, I have nothing against them doing that, I'm just saying that this is how Debian generally operates. Their extended support model still allows for backporting fixes into jessie of all things, which released almost 8 years ago.

It's really good that they do that, I respect the niche they work in, but Debian has the nasty knock-on effect of having a lot of guides made for it by third parties that recommend really outdated versions of debian which can be a nasty suprise for someone new to Linux.

(It also results in notable forks like Raspbian having a poor update cycle - I remember in particular that it took about 2 years to move from the regular EOL of wheezy to jessie.)