The 4th gen's were a HELL of a lot more reliable. And I'd have no problem recommending one. 4.5 gen's...ehh....they're hit or miss, and the 2022's were definitely MISS. 2021's are about 50% miss, 2020's maybe 40% miss. Words still out on the 2023's.
If I had to go buy a diesel today I'd be looking for a 2018 with low miles.
Still stand by my word. Towing 10k or less there's zero reason to own a diesel 3/4 or 1 ton. There's no benefit.
I disagree with your Aisin "miss" rates, where did you get them? Yes, the 2022s have problems with the K1 clutch drum snap-ring failure, otherwise, the Aisin definitely has been reliable and trouble-free.
And
Towing 10K with a 1/2 ton exceeds its factory limits and is dangerous. Bad advice!
To the OP's original post.
The trucks you could not drive are waiting for the snap-ring recall.
You wonder if it's worth the extra cost and extra maintenance cost to own the H.O.?
IMO it's definitely worth the cost. The only extra maintenance cost is to r/r the fluid every 30,000 miles
The Aisin remains the strongest pickup truck tranny on the market. And it is definitely reliable and trouble-free.
I have a 2020 3500 HO Aisin and love it. I don't tow heavy enough to warrant the Aisin, but I wanted it and am so glad I have it.