Sure, however if it still fulfills its primary function, even with a little bit of "personality", it's still fit for purpose.
Obviously, if a washing machine doesn't complete the washing cycle or a toaster doesn't toast right, it does need to be fixed or possibly replaced.
Yeah, but that's now what I wrote.
There's a long, long, infuriating way between "works just fine" and "irredeemably broken". Trust me, I know.