SWBKCB
Could be..
Certainly when I was working we could see the planned gate on a company app well ahead of boarding…(several hours).
We could also see when it had all gone Pete Thong and a gate change was in the offing……..and I suspect that was why the info didn’t go into the public domain early, for fear of folks ending up at the wrong gate, even in the wrong sub-terminal.
These days if logged in as a passenger with your booking ref into the company’s public facing site you do get gate notification, but usually no earlier than STD minus 45..about the same time it goes on the display boards.