March 8th is 3 weeks after Feb 15th, which was the target for the over 70's (and other priorities), they account for 80% of deaths, the 99% figure won't be reached until after the over 50's have been vaccinated, likely towards the end of May.
Even then we don't yet know exactly how effective the vaccines are in the real world, and there's a risk of new variants evolving that is obviously higher if the virus is allowed to spread uncontrolled in the unprotected population.
And others are complaining that too much consideration is being given to other areas, that we locked down too late, came out of lockdown too early etc.
There's plenty of evidence if you bother too look.
Case numbers started to fall long before the vaccine was being administered in anything likely to have a material effect, and the falls can be seen in groups outside that haven't been vaccinated.
Do you think there's a material difference between December and January?
Testing does not affect hospitalisation and deaths, both of which are closely tracking the case numbers.
In any event I see no evidence for this claimed switch in testing and no change in daily PCR tests performed that would indicate such a change.
Correlation does not equal causality, and in this case we don't even appear to have correlation.