That's because workaholics think they're normal and everyone else is lazy. In reality they usually either trying to hide from something in their personal life, or they really are just that boring of a person that they can't think of anything better to do than work.

This is not the same as being passionate, since that usually involves doing something for yourself rather than for another persons business.

I used to be a software developer and I enjoyed being a software developer, but I honestly couldn't give a crap about the proprietary accounting system or whatever it was that we were developing for the client. That stuff was hella boring

Exactly, loving your job doesn't prevent burnout. No matter how much you love it, if you are doing actual work (not some exec shitposting on linkedin all day) then past a certain point your body/mind will just get too tired to function well.

I genuinely love my job. I would do it for free if I could afford to. I sometimes (especially lately) work well over 60 hours a week. But I need to be careful about how much OT I let myself put in because I will burn out. I know that when I push myself too hard I will eventually start fucking up. I will start missing obvious things. I will start making stupid mistakes. With my job I am also far more likely to seriously injure myself when burned out. Allowing myself to become burned out results in worse outcomes for the customers and costs my company more money. Not to mention that if I did injure myself badly enough to be out of work then all those extra hours I put in would be outweighed be the time I miss.

A good manager recognizes that a burned out employee does more harm than good and works to prevent it. A good manager knows that keeping their employees happy, well rested, and fulfilled is in the company's best interest. Sometimes demands pop up that will require a bit of burn out to deal with but the benefit of meeting those demands needs to be weighed against the harm of that burnout. Shitty managers always severely underestimate the harm burnout causes not just to their employees but also to the company.

I don’t think it’s possible to be happy when working 80+ hours a week

I think there's a certain element of "do what you love and you'll never work a day in your life" in this.

If you're really deeply invested in a project and doing it brings you joy, then you very well might find yourself investing every waking moment working on it.

But that's not a "job", that's a "passion". You typically don't get to pursue your passions unless you already have a big passive income or a sugar daddy willing to cover your expenses.