Disagree on testing being poor.
Oxford Uni initially ran the tests on under 65's as they were unsure on the safety at the start, Pfizer and Moderna went with older groups straight off the bat. It was an ethical decision, AZ said they would have run it on older to start with but Oxford were in charge.
Once proved safe they added older groups and worked out their antibody response compared to those in the younger cohorts and it was similar.
The initial findings were to get emergency approval, there are on going clinical trials in the US which will provide more data on the over 65's.
They could have waited for the US results to come in, but why wait unless you want a stagnant roll out like the EU?
On it being intriguing I'd say it was not far off the correct term, as when they got more data it turns out it wasn't the 0.5 then full dose regimen that improved efficacy, it was the spacing between doses.
And with the South African variant the Pfizer and J&J vaccines have been hailed for their T Cell response and protection against "severe disease", where as the AZ vaccines been put down for not protecting against mild and moderate disease when it highly likely still does the things Pfizer and J&J are being lauded for.