An automatic reminder can keep a task alive after its purpose has disappeared.

Systems have no way of knowing when the reason has gone. A recurring task keeps arriving because someone once set it, and it will go on arriving long after the project ended, the person left, or the problem it guarded against stopped existing. The obedience is impressive and slightly absurd. Some of what feels like a busy week is just old instructions being followed faithfully.

Open your recurring reminders and ask of each one what would actually happen if it stopped. Delete the two you cannot justify. Systems will not prune themselves, and nobody else is going to do it for you.