> for the most part I can think of like a small handful of places where i just symmetrically encrypt at rest

Current best practices for symmetric encryption are considered PQ-safe (provided your key length is long enough). The real question the above algorithms solve is how do you safely share the key for the symmetric encryption. That’s where X25519 and ML-KEM come in. X25519 is not PQ-safe, but it is very well studied and considered robust. ML-KEM is PQ-safe, but new, and not as well tested/audited.