I’m guessing the main stands are getting too busy so these services which will be mostly alighting services (or passengers going to London or Gatwick) will now stop outside
Terminating services and services which do not pick up (which covers quite a lot of services given not all NX routes are registered to carry Heathrow-Victoria passengers, and no Flixbuses are allowed to do this either, so combine that with terminators, that's a lot of services) I fully get these moving. If it's only alighting too, you won't get people loitering.
For services towards London which pick up, yeah maybe I can get as there's going to be limited people wanting to do that too.
What gets me is including Gatwick in this. There are a so many buses now going from Heathrow CBS to Gatwick, just these alone would be enough for Consort Road to handle. Let alone adding on the other trips on top. I think it should have been terminators & Londons, or Gatwicks moving. Not both. I don't believe there is capacity for all of this, unless huge works have happened to create more stands there somehow.