Declining your manager’s meeting is a different act from declining anyone else’s, and the difference is not politeness. It is that your manager is the person who decides what you work on. A decline is a statement that you have re-decided it, and depending on the manager, that is either welcome, unremarkable, or a problem. ...
There are six types of work meetings, and every entry on your calendar is doing one of those six jobs. Once you can name which, the question of whether to keep it stops being a matter of taste. The reason this is worth twenty minutes is that meetings get judged by how they feel. A meeting you enjoy gets defended; a meeting you dread gets targeted. Neither is a signal about whether it should exist. The status meeting you like because it is the only time you talk to that team is still a status meeting, and the review you dread may be the only thing preventing a quarterly disaster. ...