I asked them in the group and the response is because there are many competitors out there that pretend to be customer and ask them about future roadmaps, so they would not disclose it in the public on an official channel. If you are interested you can talk to the Taobao/Shopee seller to join the group (usually they will ask you if you interested after you purchase their products) and you can talk directly to the people who are responsible for the app/product.

Keep in mind if you don't know what gang to buy let say 2 OR 3 gang, you can always buy the upper gang, because the extra gang can be turned off and change into a programmable settings via the app and the price difference is negligible.

For me it's master bedroom x 2
1 x 4gang - lights x2, fans, cabinet light (activated via door sensor),ventilator
1 x 3gang - toilet lights + ventilators
1 x 1gang - bedside lamp + remap the other 3 gangs to turn off room lights/ outside lights/ or turn on toilet lights

Other rooms
1 x 4 gang - lights x2, ventilatorsx1, fanx1 (For lights my room ONLY use hue lights so I allow continuous power to the lights and make the lights bright/dim using the programmable button settings, other members of the family not interested)
1 x 1 gang (not all room) beside the bed - bedside lamp, map the other gangs to turn on the lights outside/toilet lights etc

Toilet lights
1 x 3 gang - lights x 2 , ventilator x 1, extra button use to turn off everything/ turn on stairs lights

Stairs
1 x 2 gang

Living room
6 x 4 gangs - my living room is like two terrace house combine so quite side, switches on both sides so 3 each side. 1 x fan, other lights (all set to be programmable so some can on the TV.., some play songs on the HomePod, some dim the room, some brighten the room, some turn off everything so just have to press that when leaving home)

Dining room
2 x 4 gang - fans, light strip, hue lights (all programmable except for fan)

Kitchen
1 x 3 gang - light light strip ventilator

Hallway
4 x 4 gang - lights lights lights for each side + hallway fans

Should be around like that but my house have like... 8 rooms in total? Because it's like two adjacent terrace house combined..

For all the switches with 1-4 gangs, there are four buttons. So let say you buy 1 gang one, the rest 3 can be programmed to do something else like turn on the outside lights/ turn off everything downstairs etc
The 4 gang one does not have a programmable button unless you have smart lighting then you can allow continuous power OR you didn't use all 4 gangs, then can turn off one gang and make it into a programmable button

Yes get the ones with neutral wire

I think it's possible to have 1 neutral and loop to 2 switches, some of my neutral lines are looped from the nearby switch sockets too