Thats mostly just in peoples heads and rarely the actual case.
People who claim this usually don't post any evidence and don't do before/after comparisons under the same circumstances. Which ofc is hard to do.
If you can pin point what is causing the drain issue, im all for you. but if you...
Mi3W LEDs work fine. I'm using Whatsapp, Telegram, several mail clients and also call notifications work. All different colors.
LEDs work while charging and also when not charging.
(v 6.2.25)
I don't quite understand what you mean. I had the problem, that LED notifcations did not work (call, email, whatsapp). And I fixed it like I described, so it might help others.
(disabling and enabling LED notifcations during charging)