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Sure a new sequentially geared transmission can possibly shift faster and may be more efficient in burning fuel. The problems that will and do arise with new automatics is that they are too complicated, too many moving parts.
They are incredibly expensive to work and replace. I have a friend who spent near $7g replacing a sequential gearbox on a maxima with 78,000miles.
Sure, they could eventually work out the reliability issues, but then people would be less inclined to just move up to a bigger and better vehicle instead of repairing.
Personally, I'd rather have the tried and true "buggy" gearbox that I know I can pull and rebuild if I needed to. I also know that other than clutch and gear oil, my transmission will most likely still function properly when it has near 300kmiles like my truck does.
I would not be too happy with a slushbox at over 100k, not shifting up or down properly, bucking when being put in drive, just letting off the brake and having the car try to take off and then the bottom line of it feeling like a video game. An older lady I knew referred to driving an automatic as an aiming game, just kinda point and shoot.
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