ive noticed a gremlin healer in tier 2 healing crawling robots, ignoring the healer i killed the robots without much difficulty compared to killing them without a healer
on the next healer i carefully watched the gremlin heal number in red it showed 103, my gun only hit the robot once afterwards, yet 1-shotted it with 53 dmg
to me the healers do not increase the difficulty from what im experiencing, but theyre more like a nuisance, they run, they attack unexpectedly, they pretend to or maybe really do heal
They are a major pain when your dealing with a large group of Mecha Knights or Thwackers since they can put you on the run, giving the healers a chance to top off everyone. Its not difficult to outpace a healer on a single target.