That line of thinking goes against my personal philosophy. Granted I am by nature and preference a minimalist and everyone does not share that preference. It is possible to find uses for all kinds of unnecessary things. In my opinion it is much better to think "can I get by without this" than "can I find a use for this" when deciding whether to pack any given item. Also "can I get by with something smaller and lighter" might be a good question to ask yourself when deciding on an item to carry or not carry.

On the Farson... I think that taking a folder and a fixed blade is already overkill. Adding another blade doesn't make sense to me. Not sure what it weighs, but it looks way heavier than most small folders or fixed blades.

On the other hand if you don't care about weight carried and enjoy having another blade it is your choice. I don't recommend it though.