Also there isn't one profile of software developers.

At least 3 tiers: the FAANG level, the mid-size tech companies, then all the developers working for non-tech companies/administration or in IT service companies.

Even in those categories, workers aren't swappables.

If they're not swappable, that supports my claim about scarcity even more. But I also have people here saying that you can swap in anybody vaguely technical, sometimes without credentials at all, to fill these roles even at FAANG.

I happen to think workers with minimum qualifications like a CS degree can be fairly swappable, at least more than FAANG types would have us believe. But they're very elitist when it comes to hiring. I have practically given up on being hired at FAANG companies, and these days I think their jobs are overrated too. Sign up to bust your ass 50 hours per week with backstabbing snobs, till you get laid off unceremoniously. I'd rather not.