I feel like backing off after watching this.
Seems like a lot problem with smart switches, especially in malaysia where we don't have neutral wires

and i don't want to change battery every now and then like what's in the video

wow really? yea hoping it is better now also.
That's right, I am going to build my own smart home, studying things now.

Any recommendation on good smart switch?

currently eyeing on "Aqara Wall Switch D1".
but I heard some people complaining there are still light flickering issue once in awhile, and the switch can break down quite easily.