The 1st and 2nd mystic UAs said that "psionics and magic are two distinct forces". The 3rd changed it to "psionics is a special form of magic use, distinct from spellcasting". Now, it seems there is arcane, divine and psionic spellcasting. Personally, I think the 3rd did it best.
— Millstone85 (@Stonemill1985) November 30, 2019
D&D has many forms of magic, each of which can manifest through spells and without spells. This is true whether the magic is arcane, divine, psionic, or something else. For example, the mind flayer has psionic abilities that are spells and others that are not. #DnD https://t.co/9YkyAce9nE
— Jeremy Crawford (@JeremyECrawford) November 30, 2019