I don’t think SRK is such a nice place for a 9 year-old to be… but that’s just me talkin.
The mindset of a Fighting Game player is much more complex in my opinion than that of a FPS player. A FG player has to consider so many situations for multiple characters and movesets, while also considering situations for his opponent’s characters and mindsets. He also has to have really good execution in order to preform combos, mixups…etc. FG players also have to learn how to sit on a lead, how to close out a match, and perform several actions within seconds of each other.
While these elements exist in other games, Fighting games make it much more complex (varies by the game, of course) with their intracies. The casual player won’t go beyond “playing to have fun” in most cases and doesn’t learn anything besides what the special/super/ultra moves are. They don’t take time to learn all the little things about the game. Tick throws, Crossups, Mixups, Dash Cancelling…etc etc. Playing Shooters for a while, the most complex thing I learned was…flanking? There’s no intracies to the game that make it more complex than a fighter to me. Yeah, you can burst fire. Yeah, there’s grenade placement, camping and all the other things, but I wouldn’t consider Counter Strike on the same plane as any fighter in terms of Depth. Fighters have that aspect, hands down.