> Modern tech workers arguably have the best career deal in the history of humankind. I see no upside in killing the goose with the golden egg.

I agree, but that's actually one of the strongest arguments for why tech workers should unionize now. Wages are high because employees have leverage due to 10-15 years of demand for skilled workers being higher than supply. If you wait until that leverage is gone to form a union then you've lost a lot of the leverage to negotiate for better conditions as a union.

For the record, I've been in a union in another industry much earlier in my career, and I'm pretty on the fence about a tech workers union, but I think your argument is pretty short sighted.