I've made suggestions regarding this in the past that got denied, but I think it's a restriction of freedom to block this. The reason why /tppos was blocked in the past was because OPs could use it to annoy other OPs, but if this happens admins can just deal with it easily.
OPs can't run /tppos but they can do /tp and put a coordinate in. Therefore there's no reason to keep /tppos banned.
Thoughts?