Wifi is just not very efficient unfortunately. Altho tech always changes, i do remember reading an article somewhere that someone has created a wifi chip thats 100 times more efficient than todays wifi.
Wifi is just a battery hog, thats why you never see anything with wifi built in. Cant say laptops and phones and tablets, those arent meant to last 6 months on a single charge, theyre charged usually right after your done using them.
My v2 is lucky to make 2 months off of 1 charge and thats 90% manual hand turns, wifi is just not good for battery usage, thus the creation of bolt and bridge, 2 amazing devices. I love my bolt and bridge and i recommend lockitron to my friends and family, its a vast improvement.