I like this out of bounds idea.
With it, they could make the assault ladder not a fussy, borderline useless tool. Let it work anywhere within its length restriction instead of arbitrarily stopping it at edges deemed undesirable.
If you want to make a ladder to the out of bounds zone, go ahead. You've got whatever the count-down is to make something of it.
Currently it's real annoying when you can stand next to a 8-10ft wall with enemy players above it, but because it's supposed to be out of bounds, your ladder suddenly can't reach.