Mel, the word "vs." is referring to the pros and cons of the various styles of carriers, not to the wearers of the carriers. We're not saying that the wearer of a sling is a better mum than the wearer of a BB. If you read the opening post, it explains the ergonomic advantages of slings and soft structured carriers over the BB type.
And for what it's worth, a pouch sling is at least as fast to put on as a BB, if not faster. The same goes for soft structured carriers like the Ergo. And with those there is no more danger of your baby falling out as there is with the BB.
I think what you were referring to are wrap style carriers like the Hug-a-Bub. it's true, they are not everybody's cup of tea. But a soft structured carrier is a perfect compromise. It is just as easy as a BB, but the way the baby sits in it is much more ergonomically sound.

I have tried various different carrier, including a BB. The BB was alright for short term use with my then 1 year old. I'm talking about 15 minutes. But no way would I have been able to carry her in it for 3-4 hours like I could in the Ergo. So the way you use them has a huge influence on which carrier works for you.

Having said that, the main thing is that you ARE carrying your baby. Which carrier you use or if you only use your arms, that's all secondary.