Michael Thomas has been the perfect receiver for this offense the last few years.
The Saints have looked to control the ball, eliminate risks and play in the shorter areas of the field. Thomas fit the bill. He dominated at levels the league has never seen before by getting open in these areas and doing what he got asked to do.
Some commentators have twisted this into a negative -- as if being unstoppable at something is a bad thing. The implication in the criticism is just as faulty. Thomas is filling a role in the offense. He's running the routes the offense needs him to run. He isn't running those routes because that is all he is capable of doing.
The evidence is there if you look.