Question - manual says you must deflate the struts by opening the the valve on the struts? There is no workaround to make it so you can just open the main deflate valve & have the whole kite deflate? Seems like a pain.
Just in general, and this would hold for any kite. Leaving the valves in for a long time is not a good idea. I did that on my evo and it lead to expanded valve receptacle and a leak. It took some work to get it to shrink again.
In general I am willing to bet that the action of opening the valves does, at least, not take more time than having to massage air out through a two-way connection. Remember to use the valve velcro and rubber band to lock it down.