Ocaml and reasonml and f# both have it. I can see some developers like myself being a bit annoyed with the removal (but really pleased with the IDE tooling, great work!).
Was it removed to make rescript codebases more readable to javascript developers?
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Looks like you answered yourself 
I see. I can live without it, but it would be a nice addition, specially with piped expressions.
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There were multiple reasons to not support the fun keyword:
- No confusion for JS developers
- Less concepts to learn, less ways to achieve the same thing
- We spare us a keyword, which gives us more wiggle room with the grammar and its future evolution
- Less surprises due to extra function allocations in the emitted JS code
- Less parser code to maintain → less potential bugs or confusing error messages etc.
The most weight for this decision was on the complexity / maintainability side though.
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The “pipeable” switch proposal doesn’t require an extra keyword 
No idea about parser complexity though.
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