Yeah so I don't disagree with that in principle and I'm not really 'arguing' with you as such, because you're not really contradicting anything I say in my post...but I think there's a couple of things I'll add...
1) It's a dangerous precedent for footballers to pick and choose what games they consider 'important'. Where does that end? Should they not have considered Europa League qualification quite important, for example?
2) Motivated and happy footballers are more likely to play through pain or knocks than disengaged, unhappy footballers - so it says something about the general spirit at the club.
3) Waiting to be 100% isn't really viable for any athlete in any sport. You're almost always going to have a little bit of a knock, or feel slightly under the weather, or feel a little bit of a twinge...some people get in their own head and end-up becoming incapable of doing anything ever because they won't or can't knuckle down when they're 80/90% right.