> It's not much harder to use than SQLite, you get all of the Postgres features [..]

More features is a net negative if you don't need those features. Ideally you want your DB to support exactly what you need and nothing more. Not typically realistic but the closer you can get the better.

A feature you don't think you need today, might be one you actually need tomorrow. It would be short-sighted to choose some tech based only on what you need today. If the extra features don't cost you anything, I can't see that as a "net negative".