My goodness. How can you possibly say that Ubuntu hasn't changed much from 18 -> 22? There are whole how-tos that are completely useless from those changes. All sorts of things are different. That's ridiculous.
The other comment pointed out the installer, which I did forget about. But other then that what significant has changed?
Ubuntu's documentation, and lots of third party documentation targeting ubuntu, is like 10 years out of date for lots of things anyways, and even when it _works_ often gives bad advice that either was never true or hasn't been true for years.
Netplan happened on 20.04 AFAIR. Doesn't matter much for your cloud vps you never change networking on, but still.
From my perspective, it's not changed much too - I was using apt-get install nginx - I keep using it. Was using systemctl - keep using it. Cannot say I've adjusted my habits during that moves.
