the odds of reward and the risk on autopilot 5c>6c is relatively low. for example as tsubaki, fishing with ch with 5b>6c only combos on counter hit. on air hit, straight up get punished as they tech through 6c. on block, can be jabbed out. no combo on crouch. ok on whiff, but not that much range so only ok. fishing with 5c>6c results in 60+ frames of recovery on whiff, and the rest is the same.
also has massive range, a fast startup, and hits pretty high in the air too. so yeah, you really have to be careful around that move, and well, duh of course it's going to be used a lot.