You have 40,000 support articles and an app that should offer “similar articles”. Embedded at 768 dimensions in float32, that’s 40,000 × 768 × 4 bytes, about 123 MB of vectors. The standard advice is to stand up a vector database: a service, a port, credentials, a client library and a backup story for 123 MB. A file would do.

Below a few million vectors the server is the overhead, which is why the embedded field filled up fast. So the useful question is what a newcomer brings that the free libraries don’t. My answer is one sharp edge you can state in a sentence, plus measurements the others leave you to make yourself.