Why do you think TFT is so popular?
I think it's because:
You don't have teammates! All the trolls/inters/afkers/ragers etc have absolutely no effect on your game. You can carry yourself to victory! Feels good.
RNG = satisfies your gambling itch.
You don't have to play constantly to adapt to patches/metas.
You don't have to win every game to rank up.
You can do other stuff while playing (eat/smoke/watch stuff/text people etc), no 2 hands required.
There's going to be weekly patches I think? So a lot of new content/new champs & items to try out.
TFT is amazing and the update has been a lot of fun so far, even with the bugs/balance issues.