Tech

The Benefits of a Standardized MicroUSB

You apparently know little on battery technology evolution!
a charger must take care of battery type (chemicals used!), size, max number of recharge, sometime history of charge and discharge, ...
+ all the optimizations (how fast, how long, temperature, ...) (this is a company know how!) needed to keep the battery alive longer !
no way to use the same charger for all phones!
but same plug whatever it is, would be an advance and contribute to a little price reduction!