Doesn't sound ignorant at all. Sounds like someone who wants to get the best he can from his car. That he didn't fit in to a team with a very particular MO is a different issue, however. Reminiscent of Eddie Irvine at Ferrari who was constantly fighting the engineers who wouldn't let him set up the car how he wanted.
Eddie Irvine's issue at Ferrari was and is not a new one. Teams with a great #1 driver (McLaren in the Prost and Senna eras, Ferrari in the Schumacher era) had cars not only set up, they were designed around that driver's preferences. Setting up the car for Irvine was not compatible with the approach of having Schumacher as the #1 and having Irvine as his tail-gunner. They simply wanted Irvine to finish high enough and take points from the other teams to make the Constructors championship certain. Same for Rubens Barrichello. In return for being paid very well, they were expected to defer to Schumacher.
Keke Rosberg said in later interviews that John Barnard did not want to work with him at McLaren to set the car up in 1986 the way that he wanted it (Prost was an understeering driver, Rosberg liked oversteer), except at one test session where they did dial out the understeer, and then he was suddenly as quick as Prost.
Additionally, some drivers do demand set-ups that make no engineering sense, and then they can get into head-butting competitions with the team and the engineers. Patrick Head and Jacques Villeneuve butted heads during his time at Williams because Villeneuve wanted to set the car up very stiff, which Head regarded as illogical. It was a repeat of the Thierry Boutsen era, where Boutsen wanted a very stiff car with a low ride height. When Nigel Mansell showed up for his first Williams test in 1990, he tried the car, swiftly declared it "undriveable", they changed everything, and within 2 hours he was nearly 2 seconds a lap quicker.
It can go the other way also. When Benetton hired Jean Alesi and Gerhard Berger for 1996 to replace Michael Schumacher and Johnny Herbert, both drivers showed up at the first winter test and drove the Schumacher car, and they both found it almost undriveable - it was way too pointy.
It sounds like Gasly was butting heads with the engineers quite a bit during his time at AT. Having said that, the disarray at the start of the season in that team, with Franz Tost opening throwing the engineers under the bus, might be a symptom of a larger issue that affected Gasly during his time with the team.
. He should be 14-15m at least.