If you are the average whitetail hunter that never gets out of the tree and never shoots more than 30 yards there are plenty of benefits to the single fixed pin. And for young kids it's a great way to get them hitting targets on a regular basis. But hunting in the pacific northwest you are going to be extremely limited going that route.
CL and I use slider single pins most of the time. Most of our time the pin is set for 30 yards. We've both taken quick shots and killed animals out to 50 yards with the 30 yard setting. I killed two running turkeys last year at around 40 yards with it set at 30. You just need to practice a little to get your gaps down well.
For misfits like me who struggle with target panic the single pin is the easiest way to keep the mind in check. And it's really nice when that big Blue is sitting on a limb tormenting you at 43.5 yards...dial him in and decapitate that field lunch

I probably would not take that shot if my single pin was fixed.
On slow days shooting bunnies and sage rats at 100-120 yards is fun and great practice too!