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Sounds like the criteria you outline for using a library can be learnt in a second. Why is it then a differentiator between junior and senior?

I have been thinking about Rust, but it has too much stuff like ownership I rather don't want to think about on top of the already complicated things my code does.

A compiler from Swift (or a subset of Swift) to TypeScript would make it a viable option for me. Maybe I write it myself.

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It's a differentiator between junior and senior because senior people need to make "the call" on using a technology, juniors don't.

There's a couple of other heuristics for whether or not something is worth using on a project (like complexity of learning, and context within a larger stack), but suffice to say it's about looking past a specific problem and on to subsequent problems down the line.

Juniors often make the call too. Seniors make the call on major things, but there are a lot of little things juniors get to decide, and some of them become bigger over time.

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