Vaccine Merry-Go-Round: Here We Go Again!

I seem to have been going on about, what I regarded, at the time, as a 'punt' (rather than a science-led decision). This was the UK decision to increase the timing between the 2 doses of the Pfizer/BioNTech mRNA vaccine, from 3 weeks (as used in its trials) to a maximum of 12 weeks. I fully understood that the authorities wanted to maximise the number of vulnerable people being vaccinated (when available vaccine doses were limited). I worried, however, about whether a) Vaccinated patients would understand that a 1st jab only gave them limited protection and b) Extending the time of the 2nd jab to 12 weeks (after the first), would still result in the vaccine being as effective, as seen in its trials. The British Medical Association have joined in the debate, suggesting there should be a maximum of 6 weeks between the first and second doses (https://www.theguardian.com/world/2021/jan/23/doctors-call-shorter-gap-pfizer-covid-vaccine-doses-uk). This looks like a compromise? Given the debates about new variants of Covid-19 (with some being, perhaps, resistent to current antibodies), along with the possible need to modify existing vaccines, now, does not seem a good time to be 'playing' with the dose regime.