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You’re presupposing that surgical implants can’t be more responsive, intuitive, speedy, or sophisticated than an external device. The eye trackers are very useful but objectively pretty limited. Non-invasive EEG is weak and distorted because there is skull and more brain in the way, so “resolution” is limited.
If better outcomes are possible by putting electrodes as close to the signal source as can be, why not explore that option?
Why do people feel the need to disparage athletics as “kid games”? Are adults not allowed to play games? Are people not allowed to be entertained by feats of strength? Are you just mad that it’s not a “real job”?