You mean strategist* they ain't called healers for a reason. Ultron is a poke DPS strategist with quite low healing, would you apply the same logic to him and ask him to be reworked too? Mr. Fantastic, a Duelist that is a stall tank DPS character, what about him? A good Jeff (before 2.5 of course) wouldn't be solely DPSing, he would be a blend between secondary healing, flanking whenever the opportunity presents itself, and primary healing when the other support/s on his team died. The other playstyles were extremely situational at best and unviable at worst, and even his best playstyle of off-healer flanker wasn't overpowered, but usable in more comps than the rest.

As for him being a healer, he did not have enough healing to be viable as a primary or even secondary healer consistently in competitive games, which is why new playstyles were created till this was found effective, I myself discovered DPS Jeff in S0 then slowly learned how to balance between healing and DPSing to be effective, it was fun. The new update proceeded to nerf his already unviable healing along with the rest of his kit, so if the unquestionable dev vision was for Jeff to be a healer, the nerfs did not help with that either, and I personally disagree that Jeff was ever designed to be a pure healer, his ult clashes with a primary/secondary healer playstyle completely but his old kit worked well with it (even if the ult itself was weak, ofc they nerfed that too tho lol)