They’ve chosen to go back to Kingdom Halls in the UK when cases are at the highest they have ever been in the pandemic. (Estimates are more than 1 in 15 are currently infected) Even with high vaccination rates there are currently significant numbers of deaths in the UK. If they had waited, even just a few weeks, it is likely that cases will go down significantly as summer approaches.
I heard there was an outbreak in a nearby congregation following the first Sunday back, with the majority of those in attendance now testing positive.
While they allow answers from those who remain on Zoom, they do seem to only allow talks to be given by those physically in the Kingdom Hall. So it is being made clear that those who remain on Zoom are not equal to those in the KH.