Overlays? I don't know about dual GPU laptops. RCRN can be used with ENB. It's not a very big deal to me if we keep it, because it doesn't even take up a plugin slot, but I would ask, why? It is redundant. We don't keep entirely overwritten mods around simply for posterity's sake.
It's no different than what we're doing with Skyrim Performance Plus. We're only keeping it around for those that have extreme low-end systems. We'd only keep Double Cursor for those with low-end systems that can't run ENBs. Personally, I say get rid of both but I understand the reason for keeping both as well.