You have to be careful with the approach of using Postgres for everything. The way it locks tables and rows and the serialization levels it guarantees are not immediately obvious to a lot of folks and can become a serious bottle-neck for performance-sensitive workloads.
I've been a happy Postgres user for several decades. Postgres can do a lot! But like anything, don't rely on maxims to do your engineering for you.
I've been a happy Postgres user for several decades. Postgres can do a lot! But like anything, don't rely on maxims to do your engineering for you.