Normally I agree with you. I don't want to see my QB take off all the time. This past Sunday, however, I was really pleased with how/when Allen decided to take off.
He'd make a simple read of the DEs and the moment they overcommitted and were behind him he'd quickly move into the gap they left and gain easy yards. Why on earth their DEs kept making the same mistake all game I have no idea, but Allen did a good job making them pay for it.
The ramifications of this should be that the DEs the Bills face in the coming weeks aren't going to be able to pin their ears back. They are going to have to keep their gap integrity even during passing plays. This should result in Allen getting a little extra time to find WRs down field.