This hybrid/contractor-style table saw is aimed at serious DIYers and small shops that want a heavier, more stable platform than compact jobsite saws. Trunnion alignment problems (blade not square) often come from shipping bumps, loosened mounting bolts, or wear in the tilt/elevation mechanism.
Repair is usually justified because alignment work is often adjustment plus time, not expensive parts, and a correctly tuned trunnion restores safety and cut quality. Replacement is more appropriate when the saw can't hold calibration, the trunnion or cast components are damaged, or the arbor/bearings show runout-issues that affect every cut.
Also consider the fence and tabletop flatness: if those are compromised, even a perfect trunnion adjustment won't deliver consistent accuracy. Pricing reference: common retail pricing for Ridgid R4560 at Home Depot and major tool sellers.