That said, the dep people also made a similar mistake on not clearly confirming with Go core team that they had a chance to integrate dep into the official toolchain eventually. They wanted dep to be the thing, and they really thought that they were on the right track.. poor folks..

If Russ managed to influence the "problematic" group to do what he wants, rather than doing it by himself, he could give these people a meaningful place in the Go community. That is the gain. If that is worthy or not (comparing with discarding 2-month work on Russ's own time) depends on your own perspectives, and I am not sure what Russ thought or thinks. No matter how, it will affect how the community grows in the future.

So this goes back to the root issue about how the Go core team view its Google-external language community (or even more fundamentally, if they will be rewarded/recognized by Google if they did a good job on making the community happy). Specifically, do they want to carry the responsibility to deliver messages to the community clearly, at least to some certain extent? Opinionated is fine and firing users (e.g. users who think generics is a must) is fine, sometimes even preferred, but hurting people that were willing to follow and contribute might not be the best way to go.