I had another question about HST vs gear, and it hit me to ask Google's AI, since it knows everything:
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(text above was highlighted by Google, with more info on each of the four items offered below the above text)
After I read the above, I was thinking that HST is best for lower power applications, but I remembered that I've rented articulated wheel loaders before. They were larger than a utility tractor, and they are HST?!?
I guess that the word "loader" in articulated wheel loader is key. A wheel loader is more focused on a single task than a utility tractor, and that task is 99% back and forth, stop, start, reverse, etc, and that is the area where HST excels.