In a vacuum, Grayson Allen ain't anymore special a role player on offense than, say, Luke Kennard. However the Bucks system incorporates him well in a plug n play better than say, LAC did with their stacked role players. That, and what can you do when mfer goes 6 for 8 on spot up 3s.
But it also gives PHI a chance since 3pt shootin has highs and lows, which is why games can swing so wildly as we're seeing now. PHI larger problem is the over-dependence on Embiid-Harden to facilitate their entire system.