On a house built around 1993, the giveaway that it's time to replace rather than patch is usually the spring type. Extension springs stretched along the horizontal track were standard then, and after 30 years of cycling they're often rusted, stretched unevenly, or missing a safety cable - a real hazard if one lets go. If you're getting quotes for spring replacement and the tech mentions your door still runs on the old style, that's usually the point where a full door and hardware swap costs about the same as patching around a design nobody stocks parts for anymore.
Warping is the other common sign. Steel doors from that era rarely had the foam-core insulation that's standard now, so panels can bow slightly with heat and cold cycling over the years, especially on south-facing garages. A door that no longer sits flush at the bottom corners, even after adjustment, has usually reached the end of what balancing can fix.