What do you think about the rule in football that a blocker or holder needs to be declared an eligible receiver to catch a pass?

Towards the end of the Rosebowl Stanford faked a field goal (looked like it was possibly an unplanned fake, although I said to my husband before the play they should go for the touchdown). They threw a pass and it was complete, but the player who caught it is not a receiver, and had not been declared an eligible receiver, so it didn’t count.

What do you think about this rule?

By the way…Go Green! Go White! Woohoo!!!