Using learned embeddings as features is common when:

Question

Accepted Answer

High-cardinality entities (users/items) benefit from dense learned representations — Embeddings compress high-cardinality entities into dense vectors for models.

Answer

Cardinality is tiny binary flags only always

Answer

Data has no entities

Answer

You only do pure SQL joins without models

Using learned embeddings as features is common when:

Short Explanation and Infographic

Full Explanation