The joycons seem to attach as easily as a MagSafe connector… but I hope they don't detach as easily! I wonder if the handheld ergonomics were battle-tested to prevent accidental joycon detachment while gaming.
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Alternatively they could just be using really strong magnets and tight tolerances for the fit inside the Switch 2. That's a tough thing to get right though because if they make it too tight it'll be annoying to get them lined up juuuuust straight enough to snap in but if they make it too loose they can pop out too easily.