The history of Postgres sharding

Over the past 20 years, many companies have achieved such a scale that their database could no longer support the workload assigned to it. The solution is almost universally to shard the database, but only when absolutely necessary due to the added complexity. MySQL was a much more popular choice for relational databases in the 2010s and because of this, the tooling around things like online schema changes and sharding progressed much quicker.