To me, it depends on the airplane. The purpose of blipping the throttle is 3-fold: retaining airspeed, maintaining roll rate, and increase lift. If someone blips throttle during every KE position, that means some of these 3 elements needs thrust to maintain. On a really light profile or foamie, this is not necessary. Whereas on a heavy 25% aerobat, the behavior goes south during KE position unless you give it some additional thrust.

Also, larger airplanes do rolling harriers at a slower roll rate, while smaller airplanes need faster roll rates to maintain rolling harrier. Blipping throttle is much more manageable when you are rolling away a 30%er at 2 second per roll. On a 40 size profile, rolling harrier at 1 second per roll, blipping throttle at KE position, while compensating for throttling delay, is much more difficult.