There are genres of games that require fine hardware: gaming mouse, glowing keyboard, and stuff. These are not just for aesthetic purposes. Mainly, it is for convenience. But some games actually require these gaming hardware, some games do not. Games that require gaming gears are accuracy dependent games, hotkey dependent games, and fast paced games. Passive games such as puzzles do not require gaming gears, as the foundation of these games are your brain alone. Keyboard and mouse are just the input devices.
Hardware for Steam Account Users: First Person Shooting
For first person shooting fans, to maximize their experience in the genre, a gaming mouse might be required. Gaming mice feature an adjustable DPI and additional buttons on the mouse, makes it easier to reach a key without leaving the movement buttons (W, S, A, D).
With a gaming mouse on first person shooting, you are now capable of adjusting your DPI, a measurement like sensitivity. It will allow you to adjust the sensitivity of your cursor further than normal mice could do.
For casual first person shooter, you may find normal mouse sufficient. You do not need those gaming mice that make things complex due to the chemistry of sensitivity and DPI.
Hardware for Steam Account Users: Action/Fighting
Action and fighting is a complex type of genre. Their gameplay is not similar to each other, but it changes overtime: the game mechanics and the pace. A new fighting/action game features new controls and mechanics. Unlike first person shooter, you still have the same movement keys and fire button. While in fighting/action games movement and attack buttons changes overtime. There are passive action/fighting games. And there are intense and reflexes or timing based action/fighting games.
In this case, you might need both of your keyboard and mouse to be a gaming hardware. However, some action/fighting games only require keyboard as the input, some may require both: mouse and keyboard.
Hardware for Steam Account Users: Multiplayer Online Battle Arena
Generally, MOBA is a strategy game. Gaming mice and gaming keyboards are not necessary for the game. Just get a good mouse with finely built right click, as you will mash the right click button.
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