One side wall ability, are they healthy for the game?

Hi everybody

Here I open a thread to discuss about the meaning of a wall ability in this game.

At first, when a champ as a wall ability, it was most likely to say " I do my stuff here, nobody cross that line" (either friend or foe), it was more like a defensive or disengage tool, pretty close to what a wall is supposed to do in fact. (make nothing pass from both side)

This years, new kind of wall was introduce to the game, the one side wall. By being able to stop only ennemy movement or projectile, as the match go to mid/late game, the defensive aspect of them turn more and more into an agressive tool (if your team as the advantage it's even more impactfull) with not so much option left for the other team (they can fight, not us, time to back or leave tower)

As a player who saw wall as defensive ability only, I have big difficulties to find that kind of ability fair (or as riot say, fun to play against) Add to that, for me, I have the feeling that champ with that kind of ability are the most difficult to balance due to that invisible agressive power.

What are your though about one side wall spell?

ps: what I see as old wall is thing like trundle pilar, jarvan ult,... One side wall are thing like braum shield, yasuo wind wall or azir ult