Big stall converters helped to launch an N/A car (LS1, LT1) but it's not as necessary in a supercharged LSA.
Also they help with shift extension and flash points on 4 speed automatics that have only 3 usable gears that are spaced rather far apart. The 6 speed automatics have more usable gears spaced closer together, thus there is less need for stalls.
Not that a stall wouldn't help, but it's not as necessary with a 6 speed auto and gobs of torque from the engine.
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