I also sometimes (but often enough, including a time this week) hear people discuss to not install updates because of this and that.

but then if I think about it, I have trained myself too to this:

• I avoid updates to my smart tv, because I know with facts that they’ll enremovedtify it, including patching in admin access (was not obtained by a no-interaction attack), flooding it with ads and even more tracking, and even more preinstalled apps and their own tracking. this applies to any “smart” appliences
• I am cautious with android updates, because they sometimes break things with no way back, not even a real way to do backups. besides that, major version updates always reset some settings including to not connect automatically to any random ISP’s cellular network. versions starting with 8 also introduced many new arbitrary limitations out of the user’s control that cannot be reverted
• I’ve seen many apps on the play store get enremovedtified, but sometimes f-droid apps to make changes that I would wish they rather didn’t do
• windows updates breaking expected and unexpected things just as well
• linux is fragile regarding updates, though at times an immediate reboot solves it (when the issue is caused by incompatibility between the the on-disk and in-memory versions of the programs and program libraries)