Doomfist - rather than ruining his ULT, what about just tuning the amount of armor he gets from using abilities (in addition to modifying the uppercut mobility for enemies).
Symmetra - make her a relevant pick by generating some armor based off turrets attacking enemies, i.e. 1 turret hitting enemy generates 2 armor sec/ with cap of 20 armor total (in addition to her default armor)
No theyre called shield hp, Reinhardt’s “Shield” is actually called a barrier and you can confirm this in game by their descriptions everywhere the blue health is mentioned in a description (Doomfist, Sigma, Wreckingball, Lucio, Symmetra 2.0 shield gen) its called “shields” or “personal shields” while everywhere you see a barrier (Orisa, Sigma, Reinhardt, Symmetra, Brigitte, Winston) its called a “barrier” in all its descriptions the only slight exceptions to this is the names of the abilities where some dont say shields outright in the ability name or refer to it in the ability name as the other or both, and even in those cases the abilities description still labels them correctly as barriers and shields
Fact check yourself before you start correcting others
Edit 1: Gonna add this in here from when they changed the order of the hps to put temporary hp types above permanent hp types, again refered to as shields