For a great many of us climbing is utterly terrifying. Yeah, tried it. Yeah, aware that the belay rope is there. No, it still sucks and no extra happiness is anywhere to be found except happiness that it's over.
But more importantly the athletic people underestimate just how bad unathletic people are at exercise and just how much effort even something basic is for them.
Most people could not do the basic bouldering you are about to suggest to counter my point above: they don't have the arm strength. Building that strength would take at least 6 months of a dedicated workout program and a cure for whatever psychological issues are affecting their diet. Most will never get there and suggesting to them that they can sound like "just perform a magic ritual". Oh, and after 6 months of doing the impossible their achievement is "you can do the noob bouldering". Underwhelming to say the least.
But to you exercise is easy and fun and the opposite is inconceivable. And if we dare speak up - we'll be told we are our perspective, attitude, and indeed our very life experience are invalid and wrong. Go on, hit that downvote.