I have one case in mind. Say you write a long paper in linguistics in which you provide a considerable amount of examples, and you want to refer to some examples more than once. Now, writing the examples in the running text makes no sense, but writing them all at the end (or in a separate volume) makes it easier to read. From the reader’s point of view, the result is similar to endnotes: instead of ‘see ex. 15 (on this page)’ (=footnote, on the same page) you say ‘see ex. 15 (at the end)’ (=endnote).
Aharoni in Unicode 
And never ever use endnotes.
Unless you have a good reason to do so.
There is no good reason to use endnotes.
I have one case in mind. Say you write a long paper in linguistics in which you provide a considerable amount of examples, and you want to refer to some examples more than once. Now, writing the examples in the running text makes no sense, but writing them all at the end (or in a separate volume) makes it easier to read. From the reader’s point of view, the result is similar to endnotes: instead of ‘see ex. 15 (on this page)’ (=footnote, on the same page) you say ‘see ex. 15 (at the end)’ (=endnote).
If they are indeed repetitive, then it may be OK.