The flip side of that is making yourself easily taken advantage of. Hence the cliche of the hapless, happy fool. If you're in a position to not care about 5-figure differences in salaries, job opportunities, preserving your existing resources, etc, then I agree it's not worth caring. However most people have pretty limited resources, it's important to be wary of getting taken advantage of at least, if not to try and maximize your gain.
Which is why I put “though not completely! I’m not arguing for that.” It’s probably helpful to not have your ego in the drivers seat absolutely all of the time, but also to check in with it. Kinda like a really close friend that you may spend a lot of time with but nonetheless still know when to step back from and not mindlessly follow.
