Part of our jobs on the AB and TAG is to participate in various decision processes including TAG appointment ratification, AB chair ratification (for AB members), and several steps within W3C Councils.

It can be hard to tell whether an AB or TAG member is participating adequately in the group's activities, but participation in votes is a minimum bar that all members should be able to reach. If someone isn't bothering to vote, this should be visible to the AC, so they can take that into account when deciding whether to re-elect that person. (This doesn't imply that the direction of the vote should be public, just the fact of it.)