[Beltalowda]

I don't think they "needed" the Citus tool, per se, it was just the easiest option. I don't know much about MS-SQL, but no doubt PostgreSQL has areas that can be improved, or even that outright suck.

The main barrier against adopting MS-SQL is just the pricing and that it's not open source. Another thing that PostgreSQL seems to do a lot better than MS-SQL is in the extensibility department, hence we have things like TimescaleDB, Citus, EdgeDB, and a whole lot more. I can't really find anything like that for MS-SQL, but perhaps I missed it?

[electroly]

You're absolutely right. A serious part of managing SQL Server is keeping your costs down. RDS for SQL Server is so unbelievably expensive that I can't believe anyone uses it. I'm not aware of any meaningful extensions to MSSQL in the sense of TimescaleDB and friends either. I'll make the claim that we don't need Citus because everything they offer is built into MSSQL, and we don't need TimescaleDB because column stores are built in too, but if you did find some kind of deep extension you wanted to build, you can't do it. Simply not an option with MSSQL. You either build it outside of SQL Server, or you don't build it.