Does Riot Intentionally Make OP Things to Keep the Game Exciting

I remember pre-nerf WW and now I'm looking at Sated Devourer with arguably even more OP interactions. Even Runeglaive proccing. spell-effects (reported on the first day of PBE and with videos and Reddit posts to boot) seems like another example. I actually don't think AP Ez. is OP but he is now a top tier choice until next patch. Still, I can't help but think that Riot is actively trying to create imbalances and mix things up just for the sake of doing it.

Perhaps they think that this will make more people play to try out these new "OP" builds and champions. It's hard to believe they'd really be so blind as to not notice how their balance changes affect champions after so many years. I think they do it more to shake up the meta and create controversy. It's one way of keeping the game fresh and seeing how teams adapt too. People think Riot is incompetent when they make clearly terrible balance decisions but it may be that they are just great puppeteers and know how to manipulate an audience.