The ecosystem is weak not to say non-existent comparing to JS

In what circumstance is it appropriate to consider the CoffeeScript ecosystem to be distinct from the JavaScript ecosystem?

[...] and every JS solution and example out there

It seems impractical to regularly code in CoffeeScript without being fluent in JavaScript.

FWIW I agree with you about CoffeeScript being a little finicky about the syntax. There's the bit a seemingly unimportant (non -leading) space char generating dramatically different results, and also things like:

    if foo and bar is x

not grouping the way you'd (or at least I) expect.