In a "shall issue" state, there are specified, concrete criteria which are the only reasons for denial. In a "may issue" state, denial is subject to the arbitrary opinion of the issuing authority
The decision means that any "may issue" denial may be the subject of a lawsuit, with the issuing authority being required to show rational cause for his denial, and would lead to "may issue" necessarily having to be "shall issue"
Yep - EG, I own a home in NY, even though I live in VA.
I have a VA CCW.
But I cannot take even one of my pistols to NY, because I am not a NY resident.
Guess again, NY.