the delta between a graph DB and a relational DB is graph can formulate queries such as X is connected to Y, and stuff that is some kind of walk over the graph. None of that is relevant for CRUD apps.

Releational can model a graph but can only answer queries like X is an immediate neighbour of Y. It lacks the walks (SQL recursive is kinda there but not really).

The primary purpose of a DB is to serve queries. But graph DB's queries are not so useful for most "lookup" type workloads that dominate business. So a graph DB is overkill, and when you get into the nitty gritty, cannot do many performance optimizations as a result. So a graph DB is a worse relational DB. But immediate relations are what is interesting to business.