20% is fine early game, but you have to consider RE only deal damage through their gun upgrades. They also have worse survivability than Rifles and lack grenades along with snare. Rifles also have 30% weapon accuracy when they get to level 3 on top of another hit of RA.
They only can get 1 weapon and a sweeper now from the 2 weapons with a sweeper. Unlike the other engineers, RE generally don't do as much building or support due to vehicle crews so they'll be fighting more.
Do note RE were never worth 200 and Volley-Fire only had one use and that was against Ostheer pioneers who decided to close the gap at max range rather than backing away when the ability activates.
Besides, I think people would prefer not having to go Rifle, Rifle, Rifle every game to hold ground outside of certain strategies which intentionally avoid fighting until an officer arrives.
They are also one of the worst infantry in terms of cost effectiveness. They cost the same to reinforce as volks.