Me, myself, I

Joan Armatrading sang Me Myself I. Keeping Stock  used the three words together tongue in cheek to explain his use of we and us.

Both used the pronouns in tandem for a good reason and to good effect.

But why are so many people using myself by itself when they mean I or me, as a bloke on the radio just did?

Please correct me if I’m wrong, a little knowledge can induce you to state something as a fact when it’s not; but isn’t myself a reflexive pronoun not a subject or object one?

If I’m right, it may be used in sentences such as I did it myself or I washed myself. It isn’t interchangable with I or me in sentences such as X, Y and myself dagged 1000 ewes . . .  or those trees belong to myself.

You might say your good self  jokingly instead of you, but I don’t think you’d say X, Y and yourself dagged 1000 ewes  nor those trees belong to yourself.