While I see your point, there are also other use cases relevant to opening the trunk...Your significant other needs to get into the front trunk and her hands are full and you are no where near your keys, or as you are walking out to your truck passing an Echo, you ask her to open the hood instead of standing there with your hands full waiting for the hood to open all the way up. Depending on weight of the load, I may not want to stand like a flamingo trying to get the sensor to see my foot. I am hoping there is more functionality with Alexa, e.g., the ability to kneel, summon in a straight line, pre-condition A/C and heat to a specific temp / heated and cooled seats, open the tailgate to both the 90 and 180 degree positions, adjust setting of electrochromatic moonroof(if equipped), lock/unlock doors, and add or purchase things from my R1T while driving. How many times have you been driving and remembered that you need to buy something but by the time you got home you forgot? Or you are driving and you use the last bit of windshield washer fluid, just order more?
I believe it would matter in the sense now my smartphone would have two voice recognition systems running chewing up more of my phone's CPU while also being an additional drain on it's battery, in addition another very large company "listening in."
Hmm, that may save on unnecessarily using up phone resources but it would kinda of defeat the purpose of using the voice recognition when, say, you're carry something and you don't have either hand available to grab your phone and then start up the app. Of course you could always start up the app before loading up your arms, but I wonder how often people will remember to do that, I can easily see myself being half way to my vehicle and realizing "damn, I forgot to start the app and now have to put every thing down" and possible in the rain or mud.
... Ya know what solves this? Summon mode ... and the vehicle automatically opens the hood when it arrives! 
Sorry, but there will be FULL Alexa integration....
