If they just add “fluff” like better support for ram xy I don’t even use I wouldn’t care. If they add really important bug fixes (for problems I have) or important security fixes I would think about it.
On the other hand: Never change a running system.
For me it comes down to: Do I know how to fix a bad bios flash or do I have the money/mood/time to get a new mainboard if things realy went south.
I have done a few updates and was allways glad when the pc started again and nothing broke 😀