I actually feel like Java's standard library has improved considerably, especially with Java 8.
The biggest challenge at this point would be adoption. In practice, with so many packages depending transitively on things like left-pad and is-odd, introducing a consolidated package would likely just fragment things and make it worse.
Assuming that the issue of breaking thousands of packages à la left-pad is solved, I don't find micro-libraries to be particularly distasteful.
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