<snip> Knowing what I know now, I'd have been much better off with a Cat, Deere, or Ford backhoe/loader for the landscaping work I needed to do. The OP of this thread mentioned clearing woods, and even suggesting that a Kubota CUT would be suitable for such a job is irresponsible at best.
So now you know what you needed to get your 'landscaping' jobs done.
Other than a mention of having cleared some woods in his opening post in this thread I can't find anywhere the OP 'suggested' a Kubota CUT would be suited to that task. Clearing woods can vary greatly based on one's concept of what 'clearing woods' means to them. The term is too vague to pass judgement on because to one it can mean using a skidder and making a wreck of everything on site, to another it can mean clearing out dead wood and blowdowns, etc.
One thing is for sure, the used tractor you bought was used up before you got hold of it. I'm not a Kubota guy, and am not familiar with all their models, but I have neighbors and friends who have Kubotas. Not all of what you documented in the post I'm quoting took place because of 'bad engineering' on Kubota's part. If it had, they would have a rough time selling their tractors, period.
Most any piece of equipment can be used past it's design capabilities, and the result will be something like you have shown. Sure, the loader's supports could have been made stronger, and they did redesign them accordingly, as you have shown. The wheel hub/axle issue thing, I don't know, but I'd bet it was partially a function of an overloaded loader over time. The loader arm pin/bushing no zerk thing, again, not from light use of the loader. Things break. They break more when used beyond intended use specs.
I'm sorry you have found a tractor and had to deal with as many issues with it as you have. Sometimes that is what happens when one buys used, and doesn't have the guidance of the dealer, the spec sheets and a manufacturer's warranty. It is a risk one takes, and sometimes one feels the burn of the wrong machine for the tasks at hand. I bought new and not a big enough Kioti my first time out. I bent loader curl brackets like pretzels, because I was pushing the machine beyond it's capabilities. Within a year I traded up, at considerable expense, and the DK-40 I have now is the right machine for me.
What exact landscaping work did you/do you need to accomplish with the equipment you use?