This discussion about whether or not the "Elm community" will be meanies is missing the point and inventing a hypothetical scenario where you get kicked out of some club. Kind of a weird conjecture to me. I guarantee nobody truly cares that you fork Elm. The thing is that generally people who threaten to fork Elm are quite hostile on the Elm forums and subreddit.

If you fork Elm, an already tiny ecosystem, you'll realize that the hard part is building the community, not adding your pet features.

Everyone who has threatened to fork Elm has realized this at the end of the day. It's also why people overlook the lack of their pet features: because ecosystem is far more important.