You can say what you want, if you want to get into bashing other people's ideas; that's fine.
I don't know how long you have been running older equipment, but I would presume it is long enough to know that sometimes unconventional fixes need to be used.
In case you didn't read thoroughly enough let me reiterate the facts.
#1. The shaft would need to be removed and replaced or the end with the threads built up and rethreaded.
#2. The whole assembly is attached to the shaft with a bolt which will act as a shear bolt in the event the chain breaks or it is plugged. I was a little reserved about welding this solid, and wouldn't go recommending this for every slip clutch problem; but in this situation a backup situation does exist.
#3. This fix was done among others, I spent at least a week going over this machine. If I were to list all the repairs, improvements, etc; that were done before the machine went to the field it would take a page or so. This machine left the shop and harvested my 2012 corn crop without a single breakdown.
Thank you for your concern, but this was not a moronic farmer fix.