While the no warning of sector is a bit unfair, it mostly only punishes true blobbing and is an expensive end tree power on a doctrine that doesn't have all that much going for it. It's also fairly unreliable. Strafe doesn't only punish blobbers, since it can potentially hit a huge area. It pins as well as damages, is far cheaper and earlier on the tree and is on an excellent doctrine. It always hits its target as well. I'm not saying sector is perfect but it pales in OPness compared to strafe.
Stormies require forethought and planning and shouldn't enter this conversation.