I always thought more fat meant better flavor and moisture. After seeing a pitmaster trim it close for bark development, I tried it myself. The bark got crisp and the meat cooked more evenly. Now I trim it lean every time.
oh man, I went through that exact same thing! I used to be so scared to trim, worried the meat would dry out into a leather brick. Saw a video where they basically made it look like a giant steak and I was horrified, but tried it. That bark was a total game changer, like a crispy flavor crust on every single bite. The flat doesn't overcook waiting for the point to render anymore.