but people on the vaccine arm still tested positive
This is pretty disastrous for people keen on limiting the spread, if it didn't reduce transmission, as now the vaccinated people who previously would've been shielding, would've been low risk for catching the virus and if they did they would likely have been symptomatic.
If the virus makes them asymptomatic, and more likely to be out and about (which it should, people need to be out, isolation kills!) then we now have a new group of susceptible people who are likely to spread - the young age groups will now have likely 20-30% at least immunity in the herd, this group will have almost none and no symptoms to keep them in when infectious either.
This is going to make R reduction even harder - even as obviously deaths are reduced, but I don't know what the solution might be.