Last Michelin Pro4 Endurance I rode lasted over 8000km on rear. Did seem to nick up a bit more than Continentals. Replaced before PBP 2019 (with a 4000SII).
Even if the cracks are just cosmetic (sort of) they offer the way in for little sharp bits. I agree that 1600km seems an unreasonably short endurance, given the tyre model. But the seller/supplier cannot know how far you've actually ridden it. I think
@I like Skol is a bit optimistic.
I have a new one of these waiting to go on.
@Joffey - that's an entirely different failure mode, but I appreciate you're saying that, in these trying times, you'd be best to minimise the chances of ride ending failure and that brownie-point-losing rescue call.