Not really, since you would have twice as many periods of 15s downtime.
Imagine if the skill lasted 1s with a 2s cd. That's only 1s downtime between recasts, but since you're recasting it so much you barely get any active time at all. It's only up at most half the time no matter what.
Over a 30m period, the old WL would be cast 40 times for 20m of active time. The new one would only need 20 casts for the same amount of active time. With the 1s/2s idea, it would be cast 900 times for a total of 15m worth of WL.
Of course it's not always so cut and dry, since if there's regularly 15s between mob spawns where you can't actually make use of WL, the old system is better since the new one would be down when you need it. But factoring in the cast animation would make the 1s/2s version abysmal since the buff would be over by the time you just got done applying it.
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