Hmm. Your post feels like an overreaction.
No, the kit isn't ideal. Yes, as a customer it's your right to tell the dealer you don't want it unless he fixes it, and if he doesn't meet your needs, absolutely you should buy a product that suits you better.
All of those are your prerogative, I think where people take exception is the emotional content you're adding to it. It shouldn't be emotional, it's a business transaction. Buy the tractor if you want it, don't buy it if you don't want it, if you can get the dealer to change it to how you like it, that's good too. Some people would be OK with it as-is for their usage, some people would be happy to add the protection themselves. That's their right too.
For my view, it sounds like your dealer is pretty unwilling to be accommodating. I doubt it would cost them much to make the change you've requested. But that's a dealer problem rather than a Kubota problem, and some on here are reacting to your casting that as some inadequacy on Kubota's part. I suspect a dealer who was more familiar with Kubota tractors would have told you when you ordered that kit that it didn't have great protection, and then discussed with you at that time what could be done to rectify that.
Any way, if I were you I probably wouldn't have posted quite so confrontational a comment as your last one - it's not helpful and is likely to get the exact result you seem concerned about - i.e. a banning or other moderation action. It's easy enough to have a conversation without doing that - if you'd said:
I went to see the dealer again, gave him the plans for the great mod that I saw on this site. He's looking into it to see if he can do that, but he seems nervous about doing it - he wants to know that Kubota will stand behind it. It's a big deal for me, so if he won't do it then I'll probably not buy the tractor
then that would lead to an interesting conversation on here from other members. It's basically the same thing you've said, just without as much emotional investment, and it's pitching it in a way others can contribute. I think that'd be more productive than issuing ultimatums to random people on an internet site who really don't care whether you buy a Kubota tractor or not (and some of whom, this being the internet, might choose to say some things to you just for the entertainment value of it).