I expect it was Pirelli being extremely conservative for fear of the new cars chewing up their new wide tyres in a couple of laps. At least the drivers did not have to spend too much of the race looking after their tyres.
I suspect there will be races where the ultra soft might last 3/4 of the race based on what we saw in Australia. At least it will push the drivers into passing on track (if they are able to) rather than waiting for the next pit stop.
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