Why go through this trouble? Because pattern interruption leads to engagement.
When a user scrolls through a feed of generic Roboto text, their brain ignores it. But when they see a tacteing font (one that looks handwritten, stamped, or tattooed), their visual cortex fires a novelty alert.
When a destination app lacks the tactile font, a fallback table maps tactile glyphs to visually similar Unicode symbols (e.g., U+1D15E for musical tactile notation).