Originally Posted by
arlflyer
No, but it does cause the FD to have your keys already set up for you in a pack, meaning that the agent is much less likely to want to go back into the system and redo your room selection. It also means that since you are checked into a room, they are counting on you being there, and thus more likely to give away the excess inventory to other people.
Each hotel is different. It's been argued multiple times. It's a matter of the process the hotel follows. You're no more likely to not be upgraded, as to be upgraded doing OLCI.