Double shifting

I hope that is a meaningful term for changing both chainwheel and cog simultaneously.
Seems to me be a slick way of maintaining cadence given that a chainwheel change is equivalent to about 5 cog changes BUT are there any downside risks?
Seems to me be a slick way of maintaining cadence given that a chainwheel change is equivalent to about 5 cog changes BUT are there any downside risks?
vintage newbie, spinning away
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