I love Julia and part of its charm is that everything is relatively new and so quite consistent, also helped by the community ethos and technical features that aid composition.
Python and R (especially R) have plenty of libraries that are high-quality, or even industry standard, but which are decades old and feel it. Python's NLTK is 20 years old for example and it can feel grating switching between NLTK and spaCy. R has three different object systems (four according to some), so you might be using some ancient battle tested library with Hadley Wickham's latest cutting edge libraries.
Python and R (especially R) have plenty of libraries that are high-quality, or even industry standard, but which are decades old and feel it. Python's NLTK is 20 years old for example and it can feel grating switching between NLTK and spaCy. R has three different object systems (four according to some), so you might be using some ancient battle tested library with Hadley Wickham's latest cutting edge libraries.