"Can't help finding it funny though that for years Lux was considered a troll pick in support, but almost nothing has changed but the meta and what people pick then you have pros and challengers pick it and now it's way OP."
That's not true though. Over the last few years, Lux has received buff after buff after buff. Her Q cooldown used to be 15 seconds at rank 1, and now it's 10. Her W shield has been buffed significantly too (in particular, the return shield). Her E cooldown and mana cost has been reduced and the slow has been increased, and her R got a partial reset mechanic in season 7 (or 8, I can't remember). When Lulu, Janna, Orianna, and Karma got their shields nerfed after the Ardent Meta, Lux got hers buffed. The only nerf Lux has received in the last 3 years is they made her E a little bit more difficult to land.
Personally, I've thought Lux was sleeper OP for awhile now and at the very least, overtuned, and now more and more people are realizing it. In this high damage meta, Lux's kit fits perfectly, oddly enough. She has good, long ranged damage, CC, and provides a massive low cool down shield to soak up huge amounts of damage for her team. Aftershock helps prevent her from feeding in its current state too, but she's still strong with Arcane Comet and Aery too.