As someone who (unfortunately) used Meteor in the past I disagree. IMO from a dev perspective Meteor was just a poorly implemented promise at 0-effort real-time functionality on top of a database you were at the time (~2015) already interested in or using. It compounded all the problems of MongoDB with a non-perfect abstraction and javascript framework.

Whatever Postgres in WASM ends up being used for there's no way it repeats all those circumstances - at minimum Postgres is just a more appropriate tool then MongoDB circa 2015.