Definitely not all games. Factorio makes you plan, construct, and optimize a factory. Expedition 33 requires full attention due to dialog so no watching shows/music on the 2th monitor. This but also requiring communication for most multiplayer games. Planet Toaster requires being in a creative mood where you don’t need extrinsic motivation to have fun.

Basically no, not all games are low effort. I’d say the majority aren’t. And I haven’t even mentioned the games that require memorizing a complex keyboard layout or need additional peripherals.