I don't send my 5's home anymore. I used to back in the day. I had like 4-5 Minervas I didn't want, and now I only have 1. Missed out on L&D fodder for a while. Then Sothe came out with L&D at 4*, but still, I could have a high merge Minerva now.
I have all kinds of shit 5* heroes I never wanted. Keep em, you never know what'll happen. At least keep them and see if they get a unique weapon in an update one day. If you don't like that weapon, then toss em. 500 feathers is nothin.