My kids are 5 and 3.
So far I let them play some Nintendo, like Smash, Kart and Arms etc. Peggle 2....things like that.
I severely limit it to a once in a while thing. We play as a family, stuff like that. They know I like to game once in a while, but it isn't ALL we do.
I grew up gaming, and using it to escape a lot of my problems. Sometimes it helped me, but a lot of the time my parents let it consume me so they didn't have to deal with me. When I was younger I wasn't allowed to have ANY gaming and that did no help either.
Kids need parents to guide them. There are so many awesome games where a kid can have fun, learn a little, escape being a kid for an hour or two. I would push my kid in those directions and TALK to him about it. At the same time, local MP with his friends, or family will be promoted if it's the right game.
My kid playing games is just like every other aspect of his life. Confusing for a parent to sort through and decide what's best, but we take it 1 day at a time and use our knowledge to make the best moves.
I try to push him more in the direction of LEGO (the blocks) . Something I didn't have as a kid, and he is really taking to it. That's the job of a parent. If you think Fortnite is good for the kids life, let him be, or show him Breath of the Wild and sit down and play with him instead of expecting games to raise your child on weekends.
Me and my kid/will game together for the rest of our lives I'm sure. I will also parent for the rest of it and make sure it's not getting in the way of what is important. It's not that much different than regulating his TV time.