I’ve said it many times and I’ll repeat it here - Debian will be one of the few Linux distros we have right now, that will still exist 100 years from now.
Yea, it’s not as modern in terms of versioning and risk compared to the likes of Arch, but that’s also a feature!
Worth noting lest I give the wrong impression, I don't think security is a reason to avoid Debian. For me the hacked up kernels and old packages have been much more the pain points, though I mostly stopped doing that work a few years ago. As a regular user (unless you're compiling lots of software yourself) it's a non-issue
Once an OS is no longer actively supported, it will begin to accumulate known problems if the attack surface is large.
Thus, a legacy complex-monolith or Desktop host often rots quicker than a bag of avocados. =3