People need to understand that the minimum energy required to separate water from air is much higher than the minimum energy required to separate water from salt. This fact of physics means desalination will always be more efficient than water harvesting.
My understanding is that with desalination you now have the problem of all the brine (on top of needing a good amount of consumable material to do the desalination when looking at existing products).
Seems to me that if you have a device that requires no extra material consumable input that's pretty interesting? Plenty of places with access to electricity that could benefit from the lack of other material input in theory.
Does that include transportation costs?
If you have power, you can harvest water from the air wherever you are. Desalination generally requires trucking the water from the ocean to you.
I don't have the slightest idea whether transportation costs can ever be large enough to make water harvesting more efficient?