I am guessing the longer breaks are to give Michelin some extra time to work on tire design, to not risk the lives of the riders as much.
The July 2016 Cycle World magazine includes an article about the riders being told by Michelin engineers before the race that the soft version of the front tires would only last 16 laps, so Marquez ran 2:04s and 2:05s the first 16 laps at Texas, then slowed to 2:06s for the final laps, after he was ahead.
All riders found that the hard front tire tended to slide at the end of braking, and the medium front tire sometimes slid at tip-in; not the ideal conditions for any of the choices.
“Banking institutions have banished precious metals and substituted a more fluctuating and unsafe medium; they have withdrawn capital from useful improvements and employments to nourish idleness for the few, who prefer demoralizing pursuits to labors useful to the whole; the peace of the whole is endangered by evils more easily to be deplored than remedied." by Thomas Jefferson,1810 (edited)