You are certainly correct in your statement, however, I don't think the OP needs that much tractor to just pull around a spray rig and a little bit of light mowing. I would think just about any brand of entry level mower would last him for a lifetime. My brother in law used a Craftsman 6500 mowing about 2 acres of lawn and pulling a spray rig trailer for 7 years and it is still running great. His initial cost was right at $2000. He just bought a big John Deere (don't know the number on it) with power steering and the rear tires steer also. His main reason was to get the power steering because he has some issues with his wrist and shoulder so the Craftsman was a bit hard for him to steer. He has some sloping yard, but not much, nothing like what I have.
I put a hitch on my zero turn mowers and pulled my leaf sweeper, fertilizer spreader and a 2 yard dump trailer with them without issue. I don't have decades of experience using the low end mowers but for the 4-5 years that I had them, I never had any issue with the transmissions and neither have my brother in law. I think the only thing he has replaced other than blades is a broken spindle from when he hit a big tree root. He puts 75-100 hours per year on his mower (based on my 50 hours of use per year and him taking about 2 times as long).