Hi there, not sure that was a question for me ?
anyway, i can share what i know... , im using non-neutral wire switches as well, the brand im using is livolo.
So far they didnt give me any issues... but livolo switch are toggle-mode, meaning if u pair with a remote, the same button toggles it on when off, and toggle off when on.....
some other brands of non neutral switches available right now are Funry , MiniTiger, Broadlink TC2 ...
but i have follow the forum for awhile and there hav been complains on Broadlink TC2 switches have issue, lik spoilt after awhile or so, but recently i check with a seller in SG Carousell, there seems to hav a new 2019 enhanced TC2, therefore im asking ard if anybody have tried and whether the realiability improves ?
To try answer ur question,
1. what level led watts will kana flickering problem?
(think TC2 have the 100w per button restriction, and so mayb if too high watts will kana the flicker ? I'm not sure as i didn't encounter any issue with livolo switches so far )
2. For broad band tc2 no neutral, does it mean no on / off status?
(yes, almost all non neutral wire switches doesnt have feedback, which u cant see from app whether is it on/off in real-time, but i understand the new switch MiniTiger have eWelink/SmartLife app control as well, then if yes, it will have feedback status i believe, but i don't realli see anybody using this switch yet for now)
Hope it helps!