That is a warning message and not an error notification, it comes in really handy when writing a reply to know if what you were planning to say has already been posted on the thread.
That's true op, it isn't a error message it's only a notification to inform you that new replies has been made to that post, so you should be aware to avoid repeated replies. The only error you get most times is the timed out error which usually comes when you take longer time in posting your message.
A note app can function better in some areas, but it has to be one which does not collate user data from what they type and keep logs of the information.
From the list he has posted here, I don't see anyone that would be trust wordy. They are just some Ai and third party sites which is not any different from the notepad installed on your mobile. I prefer not to download third-party software, especially when it comes to writing or typing. Some of these apps might be designed to anonymously store your passwords or monitoring your activity. Instead, I typically use my phone's built-in Notepad when I need to write longer responses that I don't want to lose. I also suggest using trusted, pre-installed software for writing tasks to stay on the safer side.