If anything, 2 EWH is just as situational as a click relic. The campaign sh/abs click is better than EWH in enough endgame encounters to warrant having the freedom to swap it in. Unless of course you just don't like having to click a relic, and are ok with having a sub-optimal relic loadout in said encounters.
I don't think that the EWH relics are sub-optimal at all, I like the constant boost instead of a short time boost where it's quite possible to forget taking advantage of every time, activated wrong time and an annoying cooldown on that clicky relic makes it worse. A loot of good players use 2 EWH relics.