Guys am setting up also a mi smart home. I plan get a Google home mini. Can it command everything.

Heard people say Google home is global while mi smart home need use China server so got alot issue.

Next thing i wanna ask can I have a command like open door turn on all the lights.  Close door turn off lights but if someone in the room it stay open.

yea exactly. i find that xiaomi cannot handle complex scenario. they can only handle very very simple ones.

there is also a delay between command. i think they purposely add this in to stop a flood of instruction to their servers. let say u set turn off light + delay timer, once triggered, the light turn off and if within let say 1 min u walk into the room, the sensor dont wan to trigger the turn on light because of this. it will wait until about a minute or so only excuting next instruction. so for 1 min u in the dark. only after tht 1 min u hav to redo the trigger to move then only it start execute again. they dont even put it in queue.

I think the easiest to overcome this is to turn on all lights with switch but I thought if it uses gateway there no delay since its handle in the gateway  via Bluetooth only delay comes from phone command?

May i check with you do the Aqara gateway and app run in which region?
I am thinking to get it with Alexa/Google Home.