I went the other way. (The difference is that I keep generalized lists elsewhere but mainly use my task manager for things to which I can assign dates/times.) Whenever I have the smallest thought about making a call or planning something or buying an item I just throw it into my task manager’s inbox with a quick-add, and then deal with that list - with many items I’d otherwise have forgotten - when I had time later in the day to review them. What had me stymied for too long was trying task managers that didn’t allow for quick-adds and inbox-bucket.
Wow, that’s an expensive app.