When you are in Apple Land we don't have much to crow about. Apple start stopping upgrades to the originally installed OS after roughly about 7 years. Fairly easily extended with OpenCore Legacy Patcher though.
Of course the computers and apps still get security updates for a couple more years, but our good friends Microsoft and Adobe just love adjusting their installers so you need to be running macOS no more than two versions behind the current one to work and get all the lovely new features in things like Outlook and Word etc.
Two main rocks dropped in a small pool in the past few years have been Apple changing the System Preferences Pane for a thing of beauty that worked for 25 years, to a REALLY (compared to what it was) difficult to use piece of shit. The rumour is they hired someone who used to work for Microsoft to design it, and I can quite fucking believe it!
And anyone who purchased an iMac with a spinning HD or Fusion (larger HD + small M.2 SSD where the most used data and apps remain) and wants to use MacOS 10.15 Catalina and up will find their nice new iMac (ok, up to 2019, but that's considered new to Apple users) is running like a wet dish-rag. Apparently the new APFS drive formatting introduced in 2017 but with some big changes since, is heavily geared to SSD and in particular, NVMe/M.2 drives. I suspect that APFS causes heavy fragmentation and the computer really start to suffer speed losses. Apple MUST have known about the problem but continued to sell computers, mainly iMacs with HD's and Fusion Drives up until 2019.
I suspect Apple thought that the users would suspect their computers were just getting old, but if the HD or Fusion Drives are swapped out for fast NVMe drives (needs a small adapter because Apple) they fly. Just upgraded 2 x 2015 27-Inch iMacs for a client and he's really happy as he can still run his older version of a music-making app that has lots of plug-ins that would need a fuck-ton of money to update, but on a now much faster computer,
Also helps when OpenCore Legacy Patcher lets me not only change the drive to speed things up but allows me to install the latest macOS on basically any Mac since 2008. Having said that, have you seen the mess that is Sonoma?