And I'm well aware that the direct inspiration for many of ES6's features is probably Python (and now C# with async/await, which in turn flowed there from F#)
I'm assuming some cross-borrowing is happening here due to developments on the TypeScript team, and due to much higher similarities of the specifics with TypeScript. After all, F# has been around for quite a while, yet we're only seeing this development now - so if F# is the inspiration, why did it not happen much earlier?
As for JS itself, ES6 is a great step in the right direction, and I like it a lot, though I prefer Typescript for pretty much anything when I can use it.
Also - I didn't say that you learned it first or only, just that I see a lot of praise for 'JS features' being adopted by other languages from people who very obviously don't know any better - and this only in the last 3 or so years. So I think it's a trend.
You're right there. Tuple unpacking has existed in even stronger form (pattern matching) in most functional or functional-ish languages for ages. Python's had unpacking since God knows when. F#, which is sort of related to ML and feeds features to C# somewhat regularly, does this sort of thing as first-class syntax.
It's sort of a trend for people who learn JS first (or only) to look at features that it's had stapled to it and then point out how much other languages are taking from it.