4570 - you mentioned earlier that Kubota and JD both build a light light economy tractor with a relatively weak loader for a reason. I think you are on to something there. Its really a great marketing tool and allows for a brand to find something for everyone and compete on many levels. May not be comparable to all other brands or models, but the big ones can find something among their lineup for just about everyone.
My 2501 purchase is exactly based on the things that make an economy tractor "economy". I didn't want a fancy transmission, emissions equipment, and fancy electronics. I want BASIC. And cheap price, I won't lie. I'm not really interested in dropping a lot of cash on my machine for things that I don't need or want. And I also base my purchases on what I can legally and comfortably move with my trailer and truck without getting into CDL territory. Armchair DOT officers need not reply...
I posted a question earlier on the standard L series loaders and most people have argued in favor or not about the the real issue with them. Tractor weight. The tractors don't physically have enough weight and stability to promote a stronger loader. So to the OP, that's the reason Kubota loaders are so "weak". They are matched closely to the tractor they reside on. If you need more lifting power, Kubota makes quite a few sizes. If you need even more, they have a line of small wheel loaders that are pretty nice too.
And if Kubota is not your thing, that's good too. There are many brands out there that are awesome tractors. No hate needed.