Brigitte has Sym 1.0 E ability
B.O.B. is a level 3 Torb turret
etc.
It happened often that a removed ability got adjusted and became a new heros ability. The weapons and abilities fit for Echo and Sanjay imo.
Remember that they said they dont know what role Echo could fill. If they said: Yeah, she will be the same as Sym but with tank and/or heal capacity then everyone loses the interest in the upcoming hero.