If Aston Martin had a car even capable of going further up the grid and Vettel is really as awful as you’re saying, don’t you think Stroll should be out performing him at every racing weekend? I don’t think so... Both drivers would’ve at least got their cars further up the grid. And it’s not even open for debate. Lol. Aston Martin really did have a worse car than their Racing Point, Force India days.
And since you’ve made a point with Perez, Alonso starts further back too and he had less overtakes than Vettel in the Alpine which is def a better car than the Aston Martin. Just saying...

^ Yes, you are right on those stats but overtakes are only one factor that determines how good a driver is. There are a lot of variables working on and off the track that are important too.
For example, pitting, team-calls, and also consistency and temperament are also very important factor that defines a driver. I'm not saying that overtake stats is totally irrelevant, but in order to justify how good a driver is, a lot of variables should also be taken under consideration.
Are we discussing over if 4 time F1 champion (all back to back) is good or not? I mean for the past 60 years or so, there has been only 2 people who have managed to get that achievement, Hamilton and Schumi.
I get that Vettel had some problems with some of the teams after that, which is totally understandable but that was literally the years where Mercedes just dominated the league so much that at one point they were averaging 30+ seconds to closest other team.
Sure Vettel had that one year, but aside from that it was usually not that easy for him to beat Mercedes, even if Mazepin drove Mercedes I say Vettel wins maybe 1-2 championship at the very most, that car was THAT good, hopefully it changes this year. He may not look like much right now to many newbies but he is one of the best driver in the F1 history, definitely top 10 in the history, some may even say top 5, but top 10 is definite.