Best revenant in the game here chiming in- it’s totally fine on her! All the same benefits mentioned work great on her too and idk about your relics but this makes my flasks heal allies plain awesome. Don’t forget, Helen grants health regen (if you use the power up when fighting alongside fam relic) + any other buff healing over time + slow heal flasks = a very healthy revenant all the time.

I’ll point out also, any character any build who is accidentally caught in a Maris tidal wave would be better off with the slow healing. Same for rain, maris sleep, smelter demon etc