It makes sense for the auto start/stop to be default off because it only turns on when certain parameters are met such as voltage, temp, seat belt etc. It's so annoying that some people want it off permanently.
Each parameter you just listed is the default for daily driving, which is the very reason people want it disabled. Like I said before, VW's iteration of auto start/stop isn't the smoothest. It's too intrusive and the engine doesn't always turn off at the most ideal time causing rough restarts. I think this may be due to the AC compressor turning on / off at the same time or just before / after. I would think if you're running the AC the car would have to reach the preset temp before the start / stop feature would engage causing the engine to turn off.
Which brings me to another point. I'm in Phoenix, my AC is on for about 8 months out of the year. It's even more annoying when the car turns off at a stoplight when it's over 100 degrees outside only to turn right back on because it starts to immediately get hot in the car. How much gas are we really saving here? Tenths of gallons? Maybe hundredths? And then there's the argument of the starter wearing out faster. Would only make sense.
An option in the infotainment software should allow you to disable the feature just like everything else. You can adjust just about every last little thing down to the pitch of the interior noises. Why not be able to disable a little button that allows you to press it and turn it off anyway?