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That, and why don't worker bees heal to continue working without stinger, instead of dying?

Do bees ever heal? Is perhaps the cost of evolving a genetic apparatus for large-scale repairs higher than just birthing another individual in the comb?

I think the book The World of Bees by Charles D. Michener covers that subject. There's a pdf of that book on the net.

you could have argue bees vastly outperform and outnumber wasps perhaps due to their evolutionary advantages