It's smoother and customers prefer it.
I can tell a subtle but noticeable difference in the smoothness of the blade movement between my old 70s vintage Bucks and newer Bucks I've handled. My older ones feel a little bit more catchy or uneven when opening them. It's not horrible but if I pay attention, it's there.
In my experience, this is an example of basic trade-offs in product design, which is why we often see such big differences in products for the general public compared to those with higher levels of experience. Skis and bikes have this in spades. Most people should not be on skis made for experts nor on bikes made for dedicated riders.
Most people don't folding hunting knives to ridiculous limits like brush cutting. Personally, I think the use of bushings in the current 110 is just fine and it makes for a very pleasant experience. But it further underscores to me that when I need to cut brush, I should just choose a different knife.
Sadly, I won't make it to hunting camp in November due to foot surgery (cycling will be the death of me) but if I were going, I would be carrying my 110 as I do every year.
Buck 110 and 112 by
Pinnah, on Flickr