When regulation makes sense
If the movement is healthy, amplitude is appropriate and the watch is simply out of adjustment, regulation may be enough.
When it does not
Low amplitude, dirty or dried lubrication, wear, contamination, impact damage and erratic positional behavior are not repaired by moving a regulator.
Why inspection still matters
A phone timing app or daily-rate observation is useful but does not show the entire movement condition.
We recommend only the work the movement needs
If a healthy watch only needs regulation, we will not sell you a full service. If the movement is worn or running poorly, a simple adjustment is not a substitute for proper service.