Every RAG tutorial pulls the same move. It walks you through embeddings, chunking, retrieval, and then right at the moment of truth it says "now pick a vector database" and just... moves on.
Source: [Dev.to](https://dev.to/arya_koste_5845807df94776/choosing-a-vector-database-in-2026-pgvector-vs-pinecone-vs-qdrant-vs-weaviate-vs-milvus-422k)