I wrote a whole thread on that because I got tired of copy-pasting a long explanation on that. But tl;dr: It’s not a good idea to wait PTR to start complaining about what we think the dev team is doing wrong, in a conceptual level.
D.va has been, since launch, always in a good spot. Sometimes she got into mandatory status, but she never was a “bad” hero. So, you are right on that.
Junkrat, however, was considered a no skill joke character that couldn’t secure a kill, relying only in spam damage, and had the worst ultimate in the game because it was very easy to shoot it down. Just like Symmetra (and Torb, Hanzo, Mei, etc), he was relegated as unviable, and very often was at the receiving end of ally tilt on sight.
We had one PTR interaction in 2018 that give a lot of small changes to a lot of heroes: the one that is live right now, and that they trust so much it will not even be the patch on OWL Stage 4. That patch was an exception, and given that the current PTR patch is back to molasses change speed, it seems that they are not making it the new standard.
That is my guess as well. They are making her back from scratch in a try to salvage her terrible reputation within the community. My major problem with that approach is that:
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It feels like a slap to the face of her current fans, which actually like her current gameplay, and spent hours studying maps and turret/ult placements to benefit the team the best they can; and
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Unless they make her Brigitte levels of broken, I doubt it will work. Even if they do, see what happened to Junkrat and Hanzo, who got much better, but now they are salty because “a no skill hero is better than the hero I spent hours training”, and don’t notice the irony of that with my first complaint.