Posted by Transisto:
Thanks for clear explanations, now I understand.
What I condemn though is the cost of learning it the hard way.
Yes I understand your pain here and from other of your posts. Yes TD could be clearer. What I suggest to you and others who are planning on trusting TD with important tasks and reminders is to do some testing and experimenting before committing to your system and use of TD.
I still have a folder I label as "Exp" for experiment in which I create various kinds of tasks and subtasks just to see how they work for me. I know this is after-the-fact for you, but perhaps others can learn from your painful experience, and you can adopt the strategy for the future.
While I am not making a excuses for TD and its ease or difficulty of learning its behavior, Gcal as a calendar program that many rely on has plenty of quirks and difficulties. Trust but verify seems like a good approach.