I'm not positive about this, but we may be having terminology issues here. When you say "step ins", I wonder if some people are thinking of those click-in plate bindings. Flows and Cinch are more often described as "rear entry" or preferably "quick entry" since the first phrase just set some comedians off
I told my kids, "Someday, you'll have kids of your own." One of them said, "So will you."
-- Rodney Dangerfield.