At Ferrari he failed miserably for six consecutive years and in a couple of them Ferrari was not that behind and at some tracks even equal to Mercedes.
Exactly. Whilst Mercedes have in general been better, there was one season when Ferrari definitely had the better car in the second half of the season, and a better driver would likely have won them the championship.
I’d argue Vettel’s ‘deterioration’ has prolly more to do with low motivation and something psychological than lack of skill. If you guys remember he did some brilliant stuff when he was at Torro Rosso and was one of the most talented young drivers around at the time.
I'd agree with the motivation thing for 2020 certainly, it's difficult for anyone to be motivated when they know their contract isn't being renewed. But I can't see it being a valid point for prior seasons. He did look good some years back at Toro Rosso, but there is a gulf of difference between being a talented young driver (latest example being George Russell), and being truly world-class.