I don't think anyone should expect acquihiring an expert Postgres team to work on a proprietary product to work well, because the programmers' skills are eminen

I don't think anyone should expect acquihiring an expert Postgres team to work on a proprietary product to work well, because the programmers' skills are eminently transferrable. Half the team would probably wander off to work for one of the other postgres-centered companies (and quite possibly continue to work on the open source Citus code).