Shutter count is mainly useful as a rough indicator of wear on the shutter mechanism itself, not as a reliable predictor of failure for unrelated parts like the sensor, LCD, card reader, flash, or main electronics. Those components are more affected by age, storage conditions, handling, environment, and general use history than by the number of exposures alone.

In practice, cameras can fail for reasons unrelated to shutter count, and some issues may correlate more with physical age or long periods of disuse than with total actuations.

For maintenance, there usually isn’t much routine DIY work that meaningfully extends the life of internal electronic components. The most practical steps are to keep the camera clean, dry, and stored properly, use it periodically rather than leaving it unused for years, and address specific faults as they appear. If the shutter fails, replacement is often a normal repair rather than the end of the camera. Beyond that, preventative maintenance is limited unless a service center identifies a particular worn or failing part.