When he left, the songwriting took a big step back.
I think Brighter Than Creation's Dark is their best album, made in the wake of Isbell leaving. I think Hood is now underrated as its become cliche to bag on him. I will say that he doesn't have as good of a filter as the other guys. Cooley and Isbell could crank out three absolute gems per album, but Hood could write a song a day if you let him. Though some of his ideas our best left on the drawing board.
I think Hood is a phenomenal storyteller, though Cooley is better at creating and inhabiting a single character.
Also, if you've seen the doc on the band, the scene with Isbell playing Goddamn Lonely Love while the camera focused on Shonna Tucker is heartbreaking. I do think DBT has largely run its course, but they had about a decade long run of brilliance, which is better than almost everyone else on the planet.