Additionally it's also great to see how some Julia projects combine diffeq libraries with ML libraries and such, which is only possible if they can share data types.
@alexeypetrushin but yah competition and variety can be good too. Concepts give a chance to achieve both. For example lets say I write an FFT routine using the Vector concept and use Arraymancer for my project, someone else could swap out to a JS based vector library and reuse the FFT routine.
