I have been a UN*X, Linux, Open Source, Creative Commons type person for a long time. What John Deere and similar manufacturers are doing, will prevent me from buying anything new enough that I can't fix it (for IP reasons).
I don't think whatever tractor I get soon, is what I will keep forever. Once the fruit and nut trees get older, I think a teleoperator makes a bunch more sense, and some of those have 3 point hitch and can pull implements. I don't plan on working with big bales of hay, but who knows what might happen in a year or two. Having a slightly bigger tractor seems to have a lot going for it, if you have to handle large bales of hay/straw.
It is nice to read that my guesses about sizing seem about right.
For haying, I had bought an Austrian scythe and built a 12x16x34 square baler out of plywood and 2x4s. I don't plan on making a lot of hay, but who knows.
NPR had an article on Kernza (intermediate wheatgrass) today. Some of what I read about kernza, said that it should be planted in wider rows than say wheat, but you need to till between rows to keep the wheatgrass from taking over all the ground. I hadn't seen a permaculture response to that. But, if in the future I was to set up to raise kernza on a plot, I could have a robot keep too much sprouting between rows at bay (possibly with acetic acid).
In another life, I used to sell parts for Ford 5600 tractors. I'm glad nobody suggested an 8N.