It was rejected because of chatter problems (acc. to Goubert & Emmett) but I don't know about the rejection being 'overwhelming'. Bit unlikely that the whole field suffered chatter.
I'm 100% certain that Rossi did request a stiffer construction in winter testing. But the salient point is that
he didn't get it. Not at Qatar and not at Argentina (where Michelin only planned to bring a stiff soft for data gathering).
Stiffer casing according to Taramasso.
Taramasso confirmed Andrea Iannone and the Honda trio of Marc Marquez, Dani Pedrosa and Cal Crutchlow joined Rossi in requesting that the stiffer casing be brought to Argentina to clarify whether the 2017 decision was the correct one. “I was more satisfied with what I had last year,” Crutchlow said on Thursday, referencing his feeling with Michelin's '17 front. -
Crash.net
If it were just Redding, Crutchlow and say.. Petrucci & Zarco, then probably no.
But Iannone & Espargaro are leading development for their respective factories and I'd expect their opinion to carry more weight.
If it were say... Redding, Crutchlow, Iannone, Espargaro, Petrucci, Bautista & Zarco (four factories, six riders, zero superstars), I'd opine - yes.
For all the flubs last season, I was generally impressed by Michelin's proactive attitude. They'd want to stabilize production but I don't think they'll cut corners even if it costs a bit more. And it
is just a bit more; shipping an additional what.. 50 odd soft tyres (?) for testing @ 2/rider.
I think we're getting into semantics but okay, I'll rephrase then.
In
my opinion, its highly likely that all this is just examination at this point and Michelin are still assessing their options and studying the results from the last two rounds.
The only new/unforeseen development after the Qatar & Argentina is that the Hondas appear to be struggling (possibly Suzukis too) and fears of Rossi's demise seem to have been greatly exaggerated.