Glen, I think the previous responders hit the nail on the head....poor shifting habits. You have to take into consideration that many trike riders are people who never rode a bike of any kind before starting to ride a trike. Many of them are on trikes for medical or health reasons. Unless they are seasoned riders who have developed the proper derailleur shifting habits, you're going to see continued instances of busted blue gears, or worse.
I run a 750w. TS with a throttle on a Trident Monorail, and have equipped it with a double chainset (I think I replied to a post by you a couple months back about this) with 34-48 rings. I have been running this setup since last September with the stock blue gear, and have encountered no problems....BUT....I'm extremely
careful not to overload the drive on startup. Most of the time for normal riding I use the 48t ring and just use my 9-spd 11-36 cassette for shifting. If I have a really tough climb, I shift the front down to the 34t ring, but that's seldom. I always
shift to a low gear on the rear before stopping, and if for some reason I find myself in too high a gear for starting, I set the assist level to "off" and then do whatever is necessary to get my trike back into a useable gear for starting.
There's no question that a "soft start" program would be beneficial, but I'm not getting into the programming of the beast. it works just fine for me as it is. I guess probably I'm the exception, and not the rule, tho!