the lack of a trailing slash always worked in xf1. if you're going to write down a url for a friend it's unlikely you're going to include the trailing slash, or if someone gives the url via word of mouth, or in a chat, 90% chance they're not going to give the trailing slash.
so, this has kind of broken a lot of my route filters after upgrading to xf2; it would be nice if we could fix this to work as I believe most people would use it, maybe a feature suggestion for a future version?