My panniers wouldn't come off (I got to the point of using enough lifting force to almost get the back wheel off the ground....). The bike was delivered with them on, but I was never able to remove them. What they did do was not lock and then pop open on a country lane. So the cover fell open, smashed my wife's birthday present that fell out and then ripped the pannier cover off on the embankment (narrow lane). 250 miles in.....
BMW accepted they'd change the panniers (this was March, now July and bike and panniers all paid for in 2023 launch weekend), but just been told they are all being taken back (the panniers). And that sometime in 2025 I might get some new ones (as above). I have simply said, sort out a refund on the panniers - though thinking about it, I will also lose the central locking, which I paid for as part of the comfort pack. So I think I will be saying to them I want refunding for the top box (which has never actually been supplied to me (it's sat at dealer who said they really didn't want to fit it), the panniers AND the cost of the comfort pack (as it's the only way to buy central locking). That's nearly £2K I'd guess.
Let's see what BMW's view is