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I agree, it seems like there has got to be a way to test hard-forks and consensus changes more thoroughly before deploying them.

Here, let me help. I find it easier to learn with pictures.

They were blind to the foreseeables

Without doubt more testing was needed.

how in the heck do you have positive MANA?

I guess they just release it and let the users to test it

heard no testnet runs were done...