I've driven cars with dog-boxes before. Clutchless upshifts are fun and cool; come halfway off the throttle and apply a little pressure to the lever, and POP it goes into the next gear! You have to double-clutch the downshifts, though. The clutch was required for starting in first gear, and it ALWAYS went CLUNK into first gear at a stop.
And this was in a formula car, with a lot of compromises we would never accept in a street car.
They wear faster than transmissions with synchros, particularly when driven without paying attention. (And really, how many drivers out there do you think actually are paying attention to driving?) And they still do require clutches for initial launch and, apparently except for in motorcycles, for downshifting. And that vile noise and feel you get when you don't match revs (as you cannot do when at a standstill) is something that very few people would be willing to put up with.
-soD
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