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It definitely means you are under more pressure on your own feed.
That said, even a scrum under significant pressure (like the Tahs) is going to win far more ball on their own feed than the dominant scrum without the feed.
It's just a matter of getting a quick strike and getting the ball out the back quickly before you get driven back too far.
Advantage to the attacking team is in the scrum half feeding when they want, not on refs call, and although the feed must be straight, he can align shoulder with his props shoulder. When the hooker strikes though, definite advantage to defending team. It's quite a different dynamic than they've been used to, and SA teams started a week earlier than us, so I'll give it a few weeks to see how they adapt before jumping on the "our front row is crap" bandwagon