Yeah I agree, it seems like the extremes are taking the lead. Either real small or real big, and yes they are useful for specific tasks but as a general or common use not so much.
The under 4 inch blades I prefer folders because generally I don’t use them for tasks that need that much pressure or force where a fixed would be more appropriate. Above 4 inch I prefer fixed as I tend to use them where more force is needed. I do occasionally use my 119 or 120 for carving brisket , ham or turkey, deboning, butchering and they are ideal for that but I think for a lot of people it’s more out of novelty than a common use function or just a collection piece although I have used the 119 more.
I was really hoping to see the 117 in upgrade steel. It along with the 118 are very useful and I use the 117 more than any other fixed blade I have. For me the 4.5 inch blade seems very natural and will cover a wide range of tasks. I also like to use my 104 compadre in 4.5 inch and is a very nice camping knife. I’m considering getting the 105 pro and would be a nice size to use as well for a variety of tasks. Maybe I can get used to a 5 inch blade. I’ve never had one so maybe it’s time to try one.