That is against all history, not only in software. Postgres is obvectively better (safer, better engineered, easier to use, etc.) than MySql, just as Python is objectively better than PHP, and an AK47 was better than most other assault rifles of its time.
These concurrency issues don't fully go away by adding the feature, which is why it is taking time to work out the desired behavior there.
I prefer to work with Postgres when I can, but I also have found instances where MySQL better fit my needs, a heap table, even with more recently added index only scans ( and even reordering the table with cluster may not be desirable) you may want an index organized table (oracle term ) (mysql would say clustered index )
I am curious why even in the context of freely available engines we focus on competition, which I think can lead to great things, but I don't understand the animosity the communities feel towards one another, isn't it just a matter of horses for courses? Are we really interested in competitive kills or improving both the tools we use and our understanding thereof ?
I don't mean to single your comment out gbog, and I know this is certainly not exclusive to databases either ( witness almost any discussion of various programming languages on HN )
I do think many (most?) people are interested in seeing all tools get 'better' over time, but what needs to be improved, or how it should be improved, often don't get agreed on.