I think it is the use-case. I'm just working on my property. It's like a big lawn mower and landscaping tool. I am getting the backhoe so that I can do some light trenching work. I can also use it to plow through medium levels of bush in the way. Also good to help with spreading gravel or smoothing out a building pad. It's like - if you have a normal size house with 10k sq ft lot, you own a lawn mower. When you own 10 acres or more, you probably need a tractor of some kind.

edit: Sorry I see you were specifically discussing the FEL that can handle 4k vs 1k. Mostly Gravel is my largest use-case. I won't be able to pallet lift a ton of bricks, that is correct. But for the rest of the tool it's like a swiss army knife in that it has different attachments both on the front, the back (and the bottom).