Originally posted by big hat arxm:

by logic of not allowing bronze or iron nails through portals, you shouldn't be able to teleport with any tools, weapons or armours. it'd be tedious.

That would make them borderline useless yeah. There is an argument to be made for runs without portals at all, I may be interested in that in some future run. But that's definately not everyones cup of tea and is beyond the scope of this discussion.