do you know you can't rollback a transaction that modifies a table?
That is incorrect. No wonder you must have had a hard time with the tools if you don't even know the difference between MyISAM and InnoDB. MyISAM is basically BerkeleyDB with a server process over it. It is blazing fast for small amounts of data with low concurrency. It uses full table locking for inserts or updates. InnoDB is the engine that makes the differences between Postgres Maria/MySQL largely inconsequential.
The main difference that I see is that Postgres fans generally have the same zeal and lack of experience that Rails fanboys exhibit. I am not sure where you fall but you are doing a disservice to our community by spouting false claims when you do not understand what you are talking about. (That sounds like a rails fanboy to me.)