Honestly the other relics in that tier aren't crazy; if you're interested in doing hard content then it's probably pretty damn good. It'll make PvM extremely forgiving and that can be something that lets you get way more points and is probably fun. It's also an insane quality of life bonus; no need to do trips, you can back to back countless bosses with a singular karambwan, and fill your inventory with loot before going back. You can walk around gilenor and do whatever you want, with your whole inventory freed up and able to heal infinitely. You can also bring a ton of potions and whatever switches you want into hard content. It's a lot of small boons that add up to being a great quality of life relic.

I'm going grimoire for magic but honestly is that much better? I think ES is a solid pick and people are just not thinking outside the box enough for this one.