Here's the exact provision: https://www.law.cornell.edu/uscode/text/50/4001
I wouldn't be registering my cars, voting, etc. basically the exact same setup as any active duty person who is domiciled with Texas or Florida (or the others, just these two are the most common since a lot of people domicile at those states during training)(I also know the car registration laws vary state to state in regard to nonresident military members). As the law linked states: "solely in compliance with military orders" there is no other reason as to why I (or my spouse) would be moving to this hypothetical state except for my military orders. I'm fairly certain there are no issues with this while on active orders (for example, during seasoning), but I'm unsure if it all falls apart if you end up in traditional guard status.
Probably best to talk to a tax attorney, but I wanted to see if anyone had experience with this on the guard side.