Brainless means something stupid or foolish. That is enough to let you know that slots, dices and roulettes are not brainless (stupid or foolish) games.
You gotta take the meaning of the word in context of statement, I meant, "brainless" word here as in playing games that does not require using brain.
Brainless? I think that even without a strategy, the brain still responds and suggests actions. Like it or not, when you press the buy spin button, the automatic spin is based on a command from the brain.
Every action is also based on commands from the brain and then responded to by the limbs. It's not always about strategy, the brain is an inseparable part of every human activity.
It sounds ridiculous to gamble without using your brain, like emptying your entire mind onto the table and then starting to press the “buy spin” button.