I would think that the "obsession" your peer group has with retiring early comes more from the realization that they can retire early (they have the ability to if they want) more than anything else. Your observations of your peer group may have some selection bias present. Cast a wider net and you may come to the opposite conclusion.

I agree that many people do not find much meaning in their work, but most people also do not make as much money as software engineers do. Most people cannot fathom retiring early. It simply is impossible. A lot of software engineers are going to realize that, hey, if I save up and invest money aggressively for roughly 10 to 15 years, I will have enough to live comfortably for the rest of my life without having to do work that I do not like. However, most professions do not make nearly enough money to achieve the goal of retiring early, so they really have no reason to discuss or even ponder early retirement. It's never gonna come up.