Languages / ecosystems being immature is not a tautology. Every one is at some point immature, but it's not a self-defining attribute of a language, nor is it necessarily true for a given language. It's entirely fair to call out "this language does not have a significant, stable, healthy ecosystem behind it (yet?)" because dealing with that stands a pretty good chance of taking up a large amount of time. Some uses / users are fine with that, others are not.