While this might seem helpful when player is merely intereseted in reaching a particular point, it does not take into the account that the guidance marker can have some additional benefits for player's gameplay:
- Quickly tagging and keeping track of objects in vicinity, such as asteroids (for crystal mining), (hostile) capital ships during dogfights, piracy targets etc.
- Highlighting docking platforms during station and ship approach.
P.S.
This is essentially the feature implemented by the "UI: Accept mission for later" mod.