At the moment I do not think we should all have the same salary because in every area the cost of living is different. If you live in San Francisco or NYC you cannot pay rent with 2000$, while in some countries rent would be only 250$ a month. Same with health care, food, etc.
That's right. And this salary/price situation in certain places creates interesting moments. For example, I think it's cool to live in a small city where everything is cheap, and at the same time earn a big salary, best of all through remote work. Because a person with such a stack will keep more money for himself than someone who earns a lot, but also spends a lot. And as a result, the latter may have more expenses than earnings, I've seen such situations.