I am surprised at that. Our experience with those motors was very positive. The 6. 9 and 7. 3 in the Ford Pick-Ups were very reliable other than the crap that Ford had added on. We serviced a large fleet of bucket and digger trucks with 9. 0 power and those things were tough. A lineman is about the most brutal equipment operator that I have been around. Even saw a couple get fried, tires blew off, etc. Didn't seem to bother the engine any either time.
Everyone has different experiences, in this case mine was positive. Some others were negative, I'm sure.