> Do not reinvent the wheel to solve problems that can't be solved in much cleaner and nicer ways. Managing dependencies can be annoying, but we all bite the bullet for a very good reason, because reusing solid well tested code is a good thing.

This.

A thing that the examples on that site did not address is the power of jQuery("element.selector") selects a "bucket"/array of elements and functions are executed on each element in that bucket.

So now you may have to add that functionality into your library. Then there is always a non-logical browser inconsistency that needs to be taken care of. Then you need to write tests. Time used for managing the library piles up very fast.

Also, https://news.ycombinator.com/item?id=7154917