years ago it was suggested that 600hp was the max a stock pick up could supply for power.
its amazing how things have changed.
Well, I'm wondering if it's "stock" vs "stock-modified".
A stock fuel pickup was found to do a great job at draining the tank to low levels but at the same time was also found to be a restriction during high fuel demands (don't know if there is an exact HP limit), so many people modified their stock pickups to allow more flow, but in doing so may have created issues when the tank gets low.
After seeing it done in pictures and then actually doing it myself, I can see there being a HIGH level of variability from one person's mod to another that could cause some to have issues while others do not. Having to manually cut a hose to length and try to route it properly in the bucket introduces a chance for many variables. That said I mocked mine up several times and measured several times before cutting and routing, and I've run mine very low and not had an issue during daily driving (racing may be a different story but I've never tested that).
It was like the Eaton E-Lockers where several of us had Zero issues with wires rubbing, while others had failures due to wires rubbing on the ring gear bolts. The instructions allowed for variables which caught some and not others (whether by being careful or shear luck).