Counterbalance Never Updated
If your opener struggles, your door sags at the corners, or the springs feel undersized for the panel weight, it's often because the original door was sized to a 1998 opening and later homeowners never swapped the counterbalance to match. That's a different symptom than the sagging tracks you see on 1970s doors closer to center city - this is newer hardware carrying a heavier door than it was ever set up for.