Too many issues being tied to electronics. This morning's ride was just below freezing, nice hard frozen trails. Electronic stuff tends to crap out real fast when it gets cold...while manual pumps work. It's not that simple though, some manual pumps are not conductive to screwing around with in the cold...but electronics can be an even bigger issue. Especially when you might need to adjust pressure multiple times during a ride (in the cold). Plus, easier to leave a pump mounted on a bike. Not that there's no room for electronic ones...but putting all your hopes into an electronic part is the same reason we bring a pump in the first place, because we need some redundancy. Ever plug a tire and have the first or 2nd plug fail? I have. You might need to refill the tire multiple times. Hell, might run out of plugs or might have a leak that just can't be totally solved...but if you can fill the tire with air every few miles, you can usually still make it back in a reasonable time. This is also why I bring an extra light for my night-rides, so I'm not totally screwed if my primary lights conk out for some reason.