I agree. I consider it fairly likely that was the brief from uncle Carmelo which Michelin was happy to take up but Bridgestone was not.What I wonder is whether that is by design. Dorna is enjoying the closer racing, so why would they want to change it?
Bridgestone is a Japanese business and maybe they saw MotoGP as a way of not just advertising but improving and innovating their tyres. Michelin on the other hand might just care about the advertising. Riders still complain about the tyres and still talk about unexplainable differences etc. I've wondered if a huge part of Bridgestone leaving after 2015 was that Dorna were pushing for not so much a tyre lottery but an artificial way of keeping the races closer and Bridgestone wasn't interested in that. All the seasons Dovi was runner up were a direct result of his ability to slow races down and save tyres until the end of the race. Before 2016, I am not sure that strategy would have served him so well.
I don't know what motivates the Japanese firms but some pretense at least of research and development seems to be necessary to sell motor sport participation to their corporate bosses; even Honda with a racing tradition going back to their founder seemed to need to justify their gp bike racing effort to some extent as research into fuel economy. I agree as well that Michelin are probably happy to just be the premier class tyre supplier, and probably don't care overly that a minute percentage of diehard and/or educated bike racing fans consider their race tyres to be substandard.