There are ways to deal with them. Take a look at that thread, it has been made precisely for players in your situation. If knowing your enemy isn’t your thing, then you can skip right to part IV, in the first post. 
As for having the devs finally acknowledging the issue, I am hoping to do so by getting a clear assessment of the extent of the problem ; and updating the above thread. If you want to contribute, leave a like or share your thoughts onto it. 
MMR is only visible on loading screen for master 1 and above I think. As for leagues borders, they are made precisely to allow you to assess if you’re slightly favored, or slightly unfavored. Concealing those won’t solve anything as more than 50% of the smurfs do freelose in order to maintain a lower league, and so can have the same border than your, supposing they don’t just stay unranked.
Yeah, but you could get matched against players increasingly stronger that way, since your true MMR could in fact get much lower than your league’s floor. So you would damage the matchmaking for much more players than those having smurfing issues. Not the way to go, IMO.
Take a look at the above thread, there are better solutions listed in part III.