I'm not gonna debate mech. vs electronical, but in some way yes:
*Once setup, it keeps working and indexed, regardless of weather. An upgrade from the mechanical groupsets I've owned in my first 25 years of riding
*Every shift is the same, you don't have to think to much of how much pressure you have to apply to the levers to make just 1 shift at the rear, and not 2. At the end of ride, when tired, it's a big +. My last bike with mechanical was a Chorus / Record mix, so not low end gruppo.
*As for reliability : apart from 1 battery that went bad on the first DI2 bike, and now this (maybe faulty battery or junction), I've not had to do anything to my bike gears in >40.000km's. Not too bad But you are right, with mechanical, it's more obvious were the problem is, but is a worn shifter or derailleur spring better than a faulty battery? A snapped cable is easy to replace, nothing I can say about that