These days, using the OS's native notification would be a lot nicer than the bespoke Reminder windows Thunderbird uses. Also, it would remove the confusion when they're both used for different thing in Settings.
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Yes, and the OS remembers earlier notifications too, and you can mute, manage etc all notifications from one place (eg switching on focus mode will have an effect on TB's notifications as well).
Certainly, it is more efficient to use the OS's native notifications for centralized management.But beware of big tech (Google, Apple, Microsoft, Meta, Amazon) that essentially collects and profiles user data.I believe that Thunderbird should be completed as native.Since users have diverse tastes and values, it would be nice to add an option.
I agree this would be a great option to add. I've been looking for months for a way to do that. I even tried learning how to create a Thunderbird addon that catches calendar alarms to send them to the OS notification system (if anyone has any suggestions on how to do that, I'll take them!).
It would also be a lot nicer if the reminders appeared BEFORE an event and not 20 to 30 minutes after!