Hearth-ward I am leaving open. The shield generator is Ashlands, so the stone does nothing for most of a playthrough, and a stone nobody can use until the last biome is a weak pick in a list you spend rists on from level one. If it comes back it wants something that works earlier in the same card.
Makes sense. My main reason for this was repairs becoming more tedious as raids become more constant by stronger enemies. The addition of Thralls who can repair your builds covers this idea, so it would be more or less obsolete.