Are 5* duplicates worth keeping?

To follow onto @Lloyd6770point, I would hold onto the extra heros as well. Developers are always nerfing past heros. Thus, you will never know when a “not so popular” hero gets nerfed into a decent hero. Check the latest beta thread. Several heros that have been sitting on my bench doing nothing might get nerfed to be worth using!

:test_tube: Early Information on Additional Telluria & Vela Balance Updates [Part of The Beta Beat v31]