Healing probably feels so boring because people are so passive in seize and never want to fight. People would rather the entire alliance guard a B rank that spawned 2ft from their base, while As have spawned in the middle/on the opposing team's side. No one is going for your measly B rank out in the boonies near your base. Go take advantage of the two opposing most likely fighting for the better nodes. It's hilarious when people afk at uncontested B ranks, and claim they carried the team.