Because in D&D complex actions are abstracted behind class skills. The whole point is that it represents your character's ability to do something. Further it speeds up game play and doesn't require each player to be any kind of expert so they can focus on enjoying the game.
To strictly answer your question, it is skill based, but it's not a manual mini game.
Last edited by SacredWitness; 24/10/20 10:17 PM.
