I am a LeBlanc main and honestly, I would agree with you 2 months ago. But not now, no. LeBlanc has been falling out of favour recently. This tank meta is pretty tough for her. Her damage output is great, her mobility is reliable but her reliability in itself is bad. She has fallen from grace lately.. (now, don't give me that look)
You see, LeBlanc always has been a champion of extremes. Her early game is stupidly strong, her late game is stupidly bad! It's an unconditional way of balancing, and it hasn't been used before her or after her because it is straight up toxic. It's a toxic form of balancing a champion by keeping that champion polarizing in both a positive and negative way. But just because it's toxic does not mean it's unbalanced, because in my opinion it is balanced.
If LeBlanc has 3 kills on the opposing laner, the match-up is even. She needs those kills to get fed ASAP and make the enemy teams life a living hell untill the 30 minute mark has been reached. When that mark has been reached and assuming the adc and mid are not completely retarded and build a banshees veil, leblanc can literally do nothing. Top, jungle, support are left and with this tank meta, good luck trying to kill them. Call me stupid, but I can't even count the amount of times I literally do nothing an entire team fight along. In a team-fight the Adc needs to keep their distance from lb at all times, meaning she will have to use her distortion to close the gaps with you. Now what can she do at that point? She has 4 seconds, assuming the mid laner is near the adc and is ready to burst lb. She can 1. QRE 2.RQE 3. ERQ. All of those three won't work if the adc has veil up. 1. Q gets consumed by veil leaving RE, won't kill adc. 2. Distortion R is consumed by veil, won't kill the adc. 3. Double chains in itself is a bad combo for assasination to begin with, won't kill the adc. LB has to return and do nothing for about 15 seconds... This is looooooong enough for the enemy team to wreck the team lb is in. Her teamfighting is horrible.
Her laning is hyped way too much. Imo, the only dangerous aspect of her laning is her lvl2. As mentioned before, keep your distance. Be a pussy. If she tries to kill you by closing gaps with her W: dodge the chain, go ham on her. And if she constantly tries to kill you by closing gaps, your jungler should have easy work on her. Don't make it that hard, you can win lane against lb. If you don't feed her, and she can't roam effectively, you are basicly ruining her entire game.