As the total number of ways to accomplish a task increases it puts more burden on a programmer to recognize the usage and understand the semantic differences between the options. How many ways are there to iterate over a collection in say C++?

Libraries _can_ hide some of this, but then that might also be yet another function or operator that does the same thing. Internalizing when to use one method vs. another adds to the total cognitive load of using the language, and it takes away from the mental capacity available for the problem you are actually trying to solve.

Sometimes these differences are necessary and important, other times they are less so.