I don't have a good answer to this, but since Michelin returned, I've never heard so much spoken about tires for a single spec series.
Seems Carmelo got his wish. He wanted an F1 style tire lottery like they had few years back.
Rossi:
“Tomorrow I expect a strange race, as already happened in Italy - Rossi explains - The reason is that we do not have the right front tyre available to us: the soft is too soft, whereas the medium does not guarantee grip. It will probably take a lot of strategy.”
“The problem is that Michelin did not bring the right front tyres and it was a mistake that could have been avoided, because we tested on this track. I had told them and there could have been another option for the front, midway between the soft and the medium that we have available to us, but they didn’t bring it.”
“I don’t know who and why chooses which tyres to bring. Michelin is doing a good job, but in the last few races, they got it wrong for the front tyre selection they make available to us.”
“I think that everyone is in difficulty. The feeling is that the fastest riders are the ones who struggle less with the tyres, but no one is perfectly okay. When there is only one tyre you can use, like what is happening now, depending on your riding style and the bike, you may struggle more or less.”
Does the situation get worse with the heat?
“Absolutely. In the morning, the track is fantastic, but when the asphalt hits 50°C, everything becomes difficult and grip at the front becomes critical. For tomorrow, I’ll have to hope for a cloudy day (laughing). Another unknown is how grip on the track will change after the Moto2 race. Sometimes it gets very slippery.”
https://www.gpone.com/en/2018/06/16/motogp/rossi-michelin-made-the-wrong-tyre-choices.html