Has it?
They've gone for it on 4th down 16 times and converted 8.
Two of the failures were in the 2nd half of the NO blowout, down 24+ points. Those didn't matter.
Another was the 4th-and-7 pass to Ertz that gained 6-and-a-half yards in the final minute of the Cowboys game. They had to go for it there.
Another came with 30 seconds left, down 4 to Carolina. Again, they had to go for that.
Another came down two TDs to Tampa Bay with 9 minutes left. I would argue they had to go for that one too. After they failed, TB went three-and-out and they got the ball right back.
Another one came in the Washington game, where they went for it on 4th-and-goal at the one and didn't get it. The 'Skins went three and out, Philly got the ball right back with great field position and drove for the go-ahead TD. That's the whole argument for going for it down at the goal line: even if you don't get it, you're more likely to score next than your opponent is.
That leaves two. One was the 4th-and-1 against the Cowboys at the DAL 20 in the 2nd quarter. That failure cost them 3 points. Of course, they lost by 7. The other was another 4th down failure against TB, 4th-and-4 at the TB 49, down 13 points in the 3rd quarter. I certainly won't fault them for going for that one.
So on nearly all their failures, they were situations where they had to go for it. And yes, the failures hurt them, but the decisions didn't: there was no alternative.