I apologize if I created discomfort, it was not my intention. Just discard the word “myth” and read it as a true story.
My conclusion (last sentence) also highlights the good experience heard from others (which was a strong reason that made me switch to tubeless), but maybe the bad stories should also be heard - they might help others to make an informed decision
And yes, frustration is normal if you waste time, money and occasions to ride due to a poorly designed system. I never had issues with tubes patches, even those from non branded producers worked fast and perfect.