I've been researching the same topic.

From what I've found, the biggest advantage of running a sump is avoiding starving the pump when your fuel tank gets low.

Folks have reported instances where the draw straw will suck air when the fuel level is low.

Personally, I don't let my truck get below 1/4 tank, but I can see the advantage of having a sump for that occasion where you have to go a little extra distance between fill ups.