Prepatch today? My brain cannot BFA anymore

What would I seek on Pre-patch?

Pre-patch is not Shadowlands. It would be still be BFA. Would I still be able to do BFA activities on Pre-patch?

Would I still be able to Raid Ny’alotha? How do we kill N’zoth without Corruption? Is it too late for others to catch up to get their AoTC? BTW, killing Heroic N’zoth was my favorite BFA activity.

Would I still be able to do my M+15 runs? I know my Focusing Iris Essence would still work but surely, I wont have Corruption. Can we still beat the same hard difficulty we do in Mythic + now with zero Corruption? Could we still catchup to get Battle for Azeroth: Keystone Master: Season 4 Achievement? - Complete all Battle for Azeroth Season Four dungeons at Mythic Level 15 or higher, within the time limit.

Would still be able to do Visions even if it’s just for warming up our fingers on 5-Masks?