I think you're missing the point.

I want to develop on postgres and test on postgres because I run postgres in production and I want to take advantage of all of its features. I don't understand why a person would 1) develop/test on a different database than production or 2) restrict one's self to the lowest common denominator of database features.

Test what you fly, fly what you test.

And JSONB, but you can't insert or update in a CTE like you can with Postgres.