It's more about keeping a record of what you did and when you did it. That could help you to track changes and results (good or bad) across multiple guitars to make informed decisions going forward. For example, my spreadsheet details the guitars' build year (age), tonewoods, bracing, etc., and tracks the string change date, the type of strings used, the pickup battery change date, truss rod adjustment date, or other relevant maintenance events. I personally find it quite helpful in keeping track of my seven guitars.
While my ears can tell the difference between old strings and new, the gradual sound degradation, especially with coated strings can be more difficult to discern. That's where a maintenance record can be helpful. In several instances, I've changed strings and noted a stark improvement, even though the old strings sounded pretty good to me before the change.