Some of these are because they're not meant to categorize gameplay, but rather, what they're about or what they're for. For example:
- Simulation games can be about literally anything. The genre is just to group together games that are made to be somewhat accurate to a real life thing while also being fun.
- The party genre is full of games that are easy to pick up and play, don't require much skill to succeed in, and allow for multiple players; in other words, they're good for parties where not everyone is a gamer.
- The sports genre is a lot like the simulation genre, but for sports. The game is the sport, though how accurate it is varies from game to game.
The Action-Adventure genre is the mother of all meaningless genres though. Like, what denotes an Action-Adventure game? The fact that there's action and adventure? That's practically everything! With a sports game you know it's going to be a sport. With a Party game, you'll probably assume it's a board game or a trivia game or some arcade style multiplayer game everyone can play, but action-adventure? Uncharted and Tomb Raider come to mind, but I could also be talking about Resident Evil, Darksiders, Paper Mario, Psychonauts, Bayonetta, Assassin's Creed, Ori and the Blind Forest...
OK. Genre rant over.
EDIT: Just to be clear, this post ceased to be a counterargument the moment I started ranting about the action-adventure genre. I just...
really don't like that genre. lol