I don't know anything about California, but if those salaries are true and achievable within reasonable effort, why wouldn't young people flock from the entire nation to work in healthcare? Maybe there's some limiting factor?
Biglaw and finance consulting I doubt is open for everybody to work in, unless your parents paid for a prestigious college. The door is pretty well welded shut, as far as I know. Social media is on the other hand free to start building your audience.
Tech is the outlier, I agree with you on that one. If you have the talent you can make it in tech still as a young person only on talent and hard work.
Social media is such a tiny opportunity monetarily that it doesn't even count. It's not the money making young people flock to social media – because there is almost no money there – it is the chance of being somebody, having people listening to you and getting some respect as a person. Rather than being treated as a piece of shit by your boss for no reason.
Not in the US, but the (hard working) engineers and dentists that I personally know all needed financial help from parents to be able to afford their very humble dwellings. Every financially successful person I know either inherited real estate or bought real estate before most of humans were born. Some of them also work hard, but that doesn't influence their financials much.
I'd like to ask what is the average pay for a non-working homeowner in California? How much can they expect to earn tax free per year from their real estate increasing in value, as compared to the hard working and highly taxed nurse earning from labour?