One of the reasons that the difference between suited and unsuited connectors is larger than is commonly thought is that a flopped straight without something extra can be a problamatic hand.

It's certianly not a hand you're going to want to give up, but if you're getting much action is probabaly vulnarable.

I'm much more comfortable with a hand like 8s 7s than 8s 7c on a flop like 9s 6h 5h if I'm getting a lot of action. That backdoor flush doesn't really add all that much equity directly but it sure makes me feel better.

Of course I'm probably getting all my money in with either one of those hands.