Lucian was considered weak until people saw pros playing him, now he's considered OP.
Actually Lucian was never really considered weak he was just mainly ignored by most of SoloQ since there wasn't footage of him in the LCS. He has gained in popularity because pros can use him now. Nothing really earth-shattering happened to make Lucian OP, he's been mostly the same, in fact he's been getting hit with nerfs recently. I actually predicted a while ago in this thread that we would be seeing Lucian in the LCS.
There's a difference between being considered weak and champions that are simply ignored. Pick a weak champ and you get flamed and your team expects you to feed and lose them the game. Pick an ignored champ and most SoloQ players have no idea what to even expect lol. I'm going through the "get flamed" stage right now with Yasuo. I'll keep picking him simply because it's so damn hilarious. Sometimes I feed, sometimes I carry, in the end it's not much different then playing any other champion, but the games I feed are particularly entertaining. Apparently it's always the Yasuo pick that lost the game
Lucian has always been viable if not OP, I knew this way before the pros even started showcasing him.
Anyway, with regard to bans: I have no idea why you are all bent out of shape about the bans. There are plenty of reasons to ban champions and most of the times it IS strategic, even in SoloQ. There is a reason the bans are very common from game-to-game. Im sure the game would be mostly fine without bans at all, but taking away the feature would serve no purpose. It hurts more to not have it then to have it. Your premise is that SoloQ has no strategy involved which is patently false. Maybe the team isn't as cohesive but there are still strategies if only on an individual level. Personally my bans are normally: Amumu/Blitz/Kassadin/Thresh. I've had so many games lost due to these champs. Amumu ult is always relevent and wins team fights. I can dodge 99% of blitz hooks but it's always that 1 hook of 100 that loses the game. Kassadin roaming/riftwalking/silence is just aggravating to deal with. Thresh isn't as bad as Blitz but I hate how much CC he puts down in team fights, I normally play assassin characters, 90% slow from the Box or getting flayed or hooked is annoying as fuck. I don't ban Eve because I normally play her if unbanned or I will play a champion that dumpsters her. I don't ban Nasus because I like games to end before 35minutes and usually I play assassins that can blow him up early game.
My bans are strategic to MY playstyle but I also ban these champions because they have a very large impact on team fights. They offer the most bang for the buck. Sometimes I might ban Lucian or Vayne or whatever fotm ADC there is but that's being selfish of me as it is normally only when I intend to ADC and don't want to deal with a particular ADC in lane. Strategically I want to ban the champions that affect team fights as well as my personal play.