SRM also helps smooth out upshifting. It won't let the revs fall below the rpm that the next gear requires at the given road speed . So, the driver can take more time completing the shift without getting jerked forward when releasing the clutch pedal. It takes some of the timing/throttle-work out of smooth shifting.
Of course, a skilled driver can upshift smoothly without SRM, but it's a nice feature when you're feeling a bit lazy. IMO, it's good to turn SRM off from time to time so you stay in practice. Besides, what skilled driver doesn't like blipping on downshifts or take pride in smooth upshifts? It's fun and rewarding.
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