Ive spent a little time with it, and its incredible once you get the swing of it. And Yeah its not 100% blueprints in that regards but only a bit of setup code needed in c++ and you can then make helper functions in blueprints.
GAS does have a learning curve though, but once you get past it, it becomes so fast to setup multiconditional abilities, buffs through the use of gameplay stats, etc.
I hope you do move to GAS I love it and can’t get enough 
(plus prediction is pretty nice and works well )