I used to use a dark bag all the time because i felt i could see things better -- yeah, makes no sense.
Then i had to get a new bag which was so stiff i hated using it so went back to the darkroom, which does work fine.
Interestingly, my dark room has a number of little green glowing spots from the timers laying around, and one strip on an enlarger -- not enough to fog the film unless i waited hours or days, but enough so that, after a bit, my eyes have adjusted so i can almost see what I'm doing.
I asked a friend, once, what he did in that situation, and he said "I close my eyes."
Hey, whatever. Film never fogs, all is good.