I mean, obviously. But humans are involved so you know 100% that someone will forget it's short and when the bike finally coughs up the post it'll be bye bye cable time. Not the end of the world, but if we went through this much shit to find out what the issue was I'd rather fix properly.
You can at least fit the short one now and order a longer one so you don't have to run around LBSs looking for one in stock when you do have a working one at home
Just don't yank the seatpost