The push for new installs around here comes from two directions: age and climate. With most homes dating to the 1960s and 70s, a lot of original doors are reaching the end of useful life - not broken yet, but worn in ways that show up as noise, sag, or a track that's slowly walking out of alignment. Replacement, not patch repair, is usually the honest answer once a door hits that stage.
The mild temperate climate here doesn't throw hard freezes or heavy snow load at a door, which is one reason original doors from the 60s and 70s have lasted this long at all. But mild doesn't mean gentle. Steady sun and dry heat on a west- or south-facing door bay bakes old weatherstripping brittle and can warp lighter wood-panel doors that were common in that era. When we're asked to quote installation here, it's rarely storm damage. It's decades of UV and thermal cycling finally catching up with hardware that was never built to modern standards.