I presumed that Amazon's virtual assistant Alexa canould do nothing but adjusting room conditions by controlling smart appliances and informing you of the weather.

You could replace "could" with "other than" as well

Lately, Alexa has been equipped with a new feature called Proactive Hunches by which it proactively takes actions based on users' habits and frequent requests.

You can obtain daily commodities without being asked permissions.

Sorry, I'm not sure what you mean here. Do you mean that you can obtain daily commodities without permission from the company?

Nonetheless, I haven't found out the demandthe necessity/need for for virtual assistant AI technologies.

Moreover, I feel anxious about possible fire accidents caused by smart appliances.

I also fantasizedworry about the Locked-roomed mystery caused by Alexa.

I don't know what you mean by "locked room mystery" -- are you afraid Alexa will lock you out of your own room?

I preassumed that Amazon's virtual assistant Alexa can’t do noanything buexcept adjusting room conditions by controlling smart appliances and informing you of the weather.

This is more natural.

LateRecently Alexa has been equipped with a new feature called Proactive Hunches by which it proactively takes actions based on users' habits and frequent requests.

Larry always refers to a period of time. Since this update only happened once, recently is correct.

You can obtain daily commodities without being asked permissionsto confirm.

Nonetheless, I haven't found out the demand forelt the need to use virtual assistant AI technologiesy myself.

I also fantasized Lock-roomed mystery worried about being locked out becaused by of Alexa.