This was going on even when I was a kid (many decades ago). Parents are always looking for a way to duck their kids for an hour or two.
I don't generally see anything wrong with it, although I'm more of the type to leave the kid in the store and sit out in the corridor or car reading a book so they've got some space to do their own socializing.
Parenting is a balancing act between enough rope and tight leashes. But anyone who just straight up ditches their kids at a game store is probably not interested in finding the sweet spot.
I see it happen a lot with the (really, visibly) autistic kids. Parents go "wow three whole hours where they're focused on something and we don't have to worry about what they're doing" and just run for the hills. Which speaks more to the absolute shit state of modern childrearing than the parents.
My folks are "always" around, which is to say despite being five hours away by train we see them about once a month. At which point we're dismissed to go do whatever the fuck we want to while they're spoiled rotten. My cousin's kids are similarly monopolized.
Which is nice. I played baseball all the way through college growing up. Not because I liked playing baseball, but because my dad loves baseball. Just like I golf because my dad loves golf.
It's important to know where the line between your interests and your kid's are, and if I had no interest in war games I'd try to be respectful of my kid's and still avoid the GWS/LGS.