Pretty significant factor in what? Write down all the reasonably popular programming languages you can think of. How many have been adopted by a standards body? How many have been adopted by a standards body in their current form?
I hardly ever write code in a standardized language. Actually, I don't think I know anyone who writes code in a standardized language, because nontrivial programs in "standardized" languages almost always go outside the strict confines of whatever mediocre crap some committee adopted.
You've just proven my point while cleverly but unsuccessfully trying to avoid being responsive to my inquiry. Java was never adopted in any form by a standards body, three of the remaining four are an already-small and ever-shrinking share of the industry, and ECMAScript is never up to date with the latest developments in JavaScript.
Even if you are right, and I'd only grant you that I am partially wrong about java because the JCP has collapsed since the Oracle takeover - the rest are just you adding qualifiers to minimize the contradiction, so what?
Your position is simply to dismiss the value of standards and state that it's fine that Dart is proprietary.
Also your statement about ECMAScript is flat out disingenuous. JavaScript implementations may move ahead between ECMAScript standards, but it is standardized, and by a real cross-industry group, not just a rubber stamp from one company.
It is hard to take seriously an assertion that the level of standardization between Dart and JavaScript is comparable.
Nobody made that assertion. You made an assertion that standardization is "a pretty significant factor". You've yet to clarify what it's a significant factor in, nor have you provided evidence that it is, in fact, significant.
I also didn't state that it's fine that Dart is proprietary, and I'd appreciate you not putting words in my mouth. My position is that your premise is incorrect and Dart is not proprietary.
I hardly ever write code in a standardized language. Actually, I don't think I know anyone who writes code in a standardized language, because nontrivial programs in "standardized" languages almost always go outside the strict confines of whatever mediocre crap some committee adopted.