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Thunderbird, Outlook, Notes, even - sorry - Evernote, and of course Windows and OS - offer a recycle bin.
I can only assume that for a user with a development background, this feature is not a given. Perhaps that is why it is not yet included in Joplin.
From a non-developer's point of view, it seems to me to be a self-evident protection against accidental data loss. Most of all a trash folder is a huge plus for a carefree and already learned (!) workflow.
Finally, as a user who cares deeply about the user experience, I would also like to see a recycle bin for deleted notes in Joplin.
P.S.
I have never created or supported a pull request. And I don't know how to do it yet, but for this feature I would start exploring it! 