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The tyres were changed for safety reasons in that the old ones took too long to warm up and had to be pushed to hard in the first couple of laps to get up to temperature causing crashes in the pack off the start which was dangerous.
It has been common knowledge that the new tyres are going to be introduced so it is up to the teams to adjust. Following your logic if Bridgestone had made tyres that could not cope with the new bikes, remember Yanagawa's blowout on the Kawasaki for instance, then the tyre could not be changed mid season because the bikes had already been developed, plainly stupid.
And as to Bridgestone making different tyres available it is not in their interest in a one make series for financial reasons so wont happen.