The same argument applied to the numpy/scipy stack when it was new. R, SAS and a whole slew of other offerings were available at that time.

This view of yours as applied to something new is as old as the woods, progress and shifts take place regardless of that. Small mercies actually but some are still writing and maintaining COBOL applications and earning extremely respectable salaries from it.

All you are really saying is you will not be an early adopter. That's OK, there will be others. Your non-adoption is unlikely to be a shattering loss for you or for Julia.

Regarding whether improvements are minor or significant that's a matter of opinion.