perhaps the eagles saw the evolution of the qb position and how a mobile qb could open up the offense? i dont know, but that seems to be the way the league is going.
which doesnt mean you cant win with a statue at qb (see brady, tom), but i think its undeniable that a mobile qb opens up different things for your offense and makes it harder to play against.
college isnt a great comparable to the pros, but michigan's offense this year is just such an example.
again, not a reason to move on from goff, nor does it say goff isnt capable of winning, but just that the leahue may be changing and the next generation of qbs might be different than the last.