I think I'm going back to Debian for my servers. i wish they add 10 years lts though.
I really don't get this fascination with 10 year LTS. Why is it so hard to upgrade in half a decade ? I mean this is such an arbitrary number. If RHEL started offering 50 year support, people will complain that Debian is 1/10th of RHEL.
The ideal situation is never having to upgrade: you buy your computer, install the operating system, and it works the same until you retire it. If your computer has a 5 year warranty, you expect to use it for at least 5 years before retiring it.
A 5 year LTS is only 5 years if you install the moment it's released, but that's not usually the case; for instance, there's a new Ubuntu LTS release every 2 years, so in the worst case your LTS installation will last only 3 years. Now consider the "10 year" RHEL LTS: in the worst case (you installed RHEL 7 just before RHEL 8 was released), your LTS installation will last 5 years, perfectly matching the warranty period.
If you want to know more I wrote about it in another comment: https://news.ycombinator.com/item?id=25348914
Most of those hosting customers are not tech companies building fractionally "innovative" CRUD SaaS apps. They're SMEs who use their apps and databases to do real work: organizing their employees, procurement, running payroll, managing delivery routes, order and stock management — boring stuff like that. They very much do not want to have to significantly rewrite the back-office systems their businesses rely on because the OS changed under them. They want it to keep working for decades with as little redevelopment as possible.
Now the closest alternative is Canonical with Ubuntu Server which can be installed wherever with no strings and support purchased as required.