> commercial RDBMS comes packaged with a lot more than just the db engine
It may be strength of psql and not weakness, they are focused on one specific niche, which actually covers 95% of business use cases, and trying to do it very well.
For all other cases, there are other products as well. Most of the data science world talks R and SQL now days, and not mdx.
ms sql is making significant progress for in memory optimization and in memory oltp .. i dont think postgres have any plans in this area
also ms sql, comes with ssis, ssrs and ssas, all under the same license you pay for ms sql server
ssas has no serious competition in the open source world and i would even argue it has no serious competition in the commercial world
the point is, commercial RDBMS comes packaged with a lot more than just the db engine .. postgresql will never compete with that