6 titles in 7 years for the driver, 7 in 7 for the team. Personally, the level of the car in no way diminishes the achievements of the individual. Would Bottas be a race winner in any other team? I seriously doubt it. I dont think he is as good as Rosberg, but better than Kovalainen.
I think the only season where the dominance was challenged recently was 2018, where Ferrari were there or thereabouts. That was a season where Lewis again proved himself.
As I have said, Lewis keeps pulling it out of the bag time and time again, but in this day and age, I think it gets harder to pull off shock results in the modern era, but what you do need to do is not make mistakes, and remain focussed, and be quicker and cannier than your opposition, and have a team which is pulling in the same direction. This season, no one else has been able to mount any realistic challenge, the combination of Lewis and Mercedes has been too far ahead. What this does prove, is that a dominant car is not the only requirement to win a WDC.