For the average enterprise switching from SLES to SUSE RHEL means that update will happen in 5-7 years
I've been migrating to Ubuntu or retiring systems for the last two years and still not done. Hoping to be rid of RHEL 7 before updates stop.
I dislike windows and the M$ ecosystem but as far as server management for undocumented servers it's much easier to deal with them than for Linux stuff. For an undocumented Windows server, you send out an email, wait 2 weeks, shut it down and listen for the screams.
For an undocumented Linux server, you send out an email, wait 2 weeks, prep the fire extinguishers, batten the hatches, and wait for the mob of angry villagers to storm the DC with pitchforks because thanks to you their print server for their paper checks is now printing in Klingon and it can't be fixed without resurrecting the guy that wrote the software 6 days before he died of terminal terminal disease.
With Linux systems, sure, you can check chron and top and find what is running and where it is but it's a bit more unwieldy than the windows GUI, plus you don't always have a full list of the file and folder permissions and getting a full list of those requirements for whichever softwares are accessing them.