But I think sometimes they go too far the other way. No matter how big and strong you are, getting smacked in the head is still bad, and having a 300lb guy drop his full weight onto your legs/ankles is still bad.
Trent was a pretty decent QB before Rodney Harrison blew his knee out (in PRESEASON !!)
IIRC he even looked pretty good a couple seasons later when he came in for an injured Kurt Warner and won them some games.