I think there is now enough evidence to suggest there is a connection between the AZ vaccine and low blood platelets, and it at least needs investigating further. The numbers are so low though that you wouldn't have expected it to have been picked up during the vaccine trials.
But the case numbers linked to AZ are a lot higher than with other vaccines. The other interesting stat is that the overwhelming majority of cases are women with quite a big age range of 20-55. I say interesting, because we also know that the contraceptive pill is also known to come with a risk of low blood platelets. Obviously I'm not an expert in this field, but I wouldn't be shocked if it turn out that AZ vaccine may be reacting with some women who are currently taking, or have been taking within the last few years, a certain make of contraception pill.
In any case, we know these very rare occurrences are happening principally in women so we can factor this into our vaccine planning going forward. My personal opinion is that the occurrences are so rare that countries shouldn't be interrupting the vaccination process as people are far more at risk from low platelets from catching the covid virus. But as different vaccines come on board, they can plan so those at risk of blood clotting, ie younger women, are offered different vaccine.
I see the AZ vaccine as the main route out of the pandemic for the poorer countries, seeing as it's the only none profit making one on the market. If this contraception pill theory play out, or something similar, it probably won't effect any of those countries anyway.