About 10 years ago when I was carrying my last baby (gosh, I feel so old now!), I loved my Maya Wrap. I used it as a primary tool for getting my baby around, though I did have two strollers I occasionally used mostly for my older toddler. My baby was colicky and high strung, and I carried him every day for well over a year, often for hours at a time.
I used the unpadded ring sling. As long as I switched shoulders every couple of hours, it was comfortable. It also is very versatile for different positions for the baby, and I used the "tail" as a cover for nursing.
At that time, the Maya Wrap seemed to be the most common brand for babywearing (I don't know if it really was, or if that was just my perception because of the circles I was in). Unpadded ring slings were their most popular product. Over the years, they seem to have reduced their ring sling designs quite a bit, and now have wraps and padded slings as well. Other brands of slings and baby carriers have become more popular. I'm glad to see that, because it means there is a demand for slings and carriers and the variety available means there is something for everyone.
But you rarely hear about the Maya Wrap anymore. Why have the original unpadded ring slings fallen out of fashion?