Just checking for updates is fine, actually installing every single firmware versions is bad.
This is because embedded firmware are less moving parts more tightly packed, which makes their failure modes inevitably catastrophic; they're incapable of progressively degrading like Electron apps, but the whole system always spontaneously crash into the wall and die from just one typo, and you don't want that.
If it broke, fix it.
If it ain't broke, don't fix it.
The latter became a rule of life because many people decided to fix what ain't broke and got burned for their troubles.