LYDTYSS is the full acronym — every word present, nothing compressed, the whole sentence rendered in seven letters. It's the version you type when you want someone to know exactly what you mean before you've established the shorthand.
At seven characters it's already private — this is a phrase that belongs to a community, spoken in spaces where the full meaning is known. The acronym doesn't explain itself. It assumes shared ground.
The weight of the phrase is preserved here: the downward direction (D), the possessive (Y — Your), the movement through scales. Every syllable that earns "star stuff" its landing is still visible.