Keyword Cannibalization

This is similar to duplicate content. If you target hundreds of pages after the same keyword then Google will find the most relevant page and tend to ignore your other pages. This leads to a suboptimal result.

Keyword Cannibalization like duplicate content is something that you should avoid. Try to make all your pages unique and target each after a different keyword. True, there will be some overlap, but do not have hundreds of pages all going after one keyword.