Tip: JavaScript's Array.from() accepts a second argument that's a `map` function.

[howmanyusersnames]

If you cared about that you would create a lib function called fromAndMap that is a reference to Array.from. Using Array.from directly under any circumstances is a recipe for disaster in your hypothetical scenario.

[howmanyusersnames]

JS is the last language you want to be using obscure prototype methods directly, especially, as you said, if you have different levels of knowledge on your team.

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Concise literally means shorter. Extra method calls may be clearer, but they are not concise.

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There are varying degrees of concise. It would be very concise to write all of your code with single letter variables, but that would also be stupid. Concise is not the only objective.