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I don’t think that there is the special reason, probably it will be introduced in some of future versions. Personally, I like Try monad as special case of Either. But not a big fan of pure Either, because of the same reason I don’t like Pair so much (and especially tuples with more components), just because your API now uses meaningless `first`, `second` or `left`, `right` properties. I prefer more strict convention like `value`, `error` (same as data class instead of tuples)
But anyway, I’m not a functional programming guy, so maybe someone who has more experience in function programming has different opinion.