> In fact I’ve only worked on one system that had the kind of scale that would justify the additional complexity of a distributed architecture. Ironically that system was a monolith with Postgres.

This...doesn't seem to support your case at all? Maybe if you'd turned all those distributed architectures into monoliths you would've then thought the distributed architecture was justified (since you have a 1 of 1 case where that was the case).

I'm guessing the truth is somewhere in the middle, but unfortunately it's not very useful to the reader to say "well, some systems are better distributed, some systems are better as monolith". The interesting question is which is which.