Only if 80% of the use cases are extremely simple use cases, with no need for multiple indexes per table, complex queries, common table expressions, user define

Only if 80% of the use cases are extremely simple use cases, with no need for multiple indexes per table, complex queries, common table expressions, user defined datatypes, window functions, asynchronous queries, or a strict stance on undefined behaviors, etc. The problem I see is that simple use cases gradually become slightly-less-simple use cases. And the pain of switching is 1000x the pain of taking a few extra steps up front and using a better database.