The problem with astro cards right now is largely community perception on healing. Astro cards effects are not going to save someone from death by themself, so many astro's just opt to not use them. (even the bole despite how strong a 10% mitigation CD is). Many astro's seem to not understand how the arrow works too, which doesn't help things.

But right now astro's mitigative and restoration cards are designed to make mechanics comfier, or to throw on someone who messed up a mechanic, where as the community seems to think that if it doesn't directly prevent death then it's not worth pressing. Which is pretty silly honestly. I wouldn't complain if the cards got a buff, but it'd be nice if players just learned that mitigating more = a good thing.