Even if the stairs are for fires so they dont go to the roof. What if you are on the roof when a fire breaks out
your gonna want that stupid ladder to be there so u can use the stairs.
Plus seriously 95% of the stairs were super hard to get on for no reason. Character simply would latch on while jumping even though it was totally possible lol id have to use dumpsters or cars to get some height then make a strategic jump and pray. Then only to find once you get to the top its an inch to high.... Or they even made an opening in the wall for the ladder to go but guess what! No ladder..
I honestly think they either got lazy, or just R* trolling us lol