[2], [3] and [4] I would argue are not problems specific to JS, but are problems with "lingua francas" in general. Ubiquity, massive massive general popularity and low barriers of entry for a language will lead to an ecosystem dominated by the NIH and overengineering of eager & inexperienced programmers, and by egos. This would occur were any language put in JS' position.

The challenge is navigating such ecosystems in a selective and informed way, which is a programming skill in itself.