If you think there is ANY world in which a Widow will do more damage than an Ashe then you are delusional. She also will almost always have less elims, obj time and probably less on fire time but that stat is hilariously pointless. They are both DPS heroes. They just do different things.
The core problem with what you are doing is you are trying to use facts to suit theories rather then theories to suit facts. DVA has always been less damage then Zarya even when DVA was mandatory and Zarya was a trashcan for this exact reason. ANY GM player could probably do far more raw damage on most heroes but it would help because that is not what the purpose of most of those characters are. DVAs goal is not to farm up an ult, its to dive on the lower health heroes and either kill them or make them useless. Sigma used to do this job better but with the nerfs you can finally pick DVA and have her do the role very well. Also its worth noting that DVA/Ball was already better on some maps to run then Orisa/Sigma anyway.
Also WHEN that comment about Genji was posted (also I almost did a spit take when you tried to argue that he would cite GM players but then not talk about the competitive mode as though it would be worth posting what the GM stats in 3v3 are), Genji had 4x the pickrate on overbuff since the patch. You can see how they have normalized more because since that post Soldiers pick rate has doubled thus pushing the numbers to be closer together. They have posted numerous times that Overbuff does not have accurate win rate statistics and its not Overbuffs fault because they do not have access to all of the data anymore.
Without looking at your account, I am guessing you are a DVA main so accepting that your hero is strong would mean she might get nerfs in the future but I do not see that happening. She is strong and unquestionably meta and certainly the second best tank but the gap between 2nd and 5th is small so there is no need to take action. Outside of Winston and Roadhog being too weak and Rein being a tad too strong (if he gets nerfed it will be very minor) the tank role is nearly perfect.
People get too defensive about their heroes and it causes a lot of biases. DVA is not the mandatory pick she was a year ago but she is still meta and still the second best tank but its fine to be second best if you are not mandatory in all situations.