I know I’ve been part of this thread but to be honest, I opted out of the IDV app once I finally received my invite on the 7th September. I think there’s just a general backlog, with some categories worse off than others.
I was exhausted with the app and sick of the process so I decided not to upload through there at all. I was able to book and attend an appointment on 10 September, and I still have no movement either. Applied 16 June FLR(M).
At this point everything is speculation unless UKVI tell us more which they won’t. I’d say do whatever feels right for you - IDV app only, in person only, or dual submission. All the forums I follow only seem to be seeing movement on ILR, Tier and Switching applications 😐
Without UKVI saying anything though, we will never know. I’d say if you decide to go for an in-person don’t get your hopes up too much.