CEOs and lawyers don't appear to really need any union
If Apple devs had the same revenue sharing agreement the NBA players do and received a similar share of Apple’s revenue, the median pay would be around $600k. That’s just the median, think about that.
Just because engineers are well-compensated compared to the rest of the economy doesn’t mean that we can’t benefit from organized labor.
I’d expect the latter to be much harder to replace than that.