Because every ORM sucks outside of the ones built on top of Linq.
Linq is great because it makes a query language a first class citizen and it decouples writing the query and the implementation.
Linq => expression trees => provider => native query language of data source => data source.
Written correctly, you can pass expressions around like:
repo.Find(c => c.age > 65 && c.gender == “male”)
And the expression can be interpreted at runtime by either EF creating native sql or the Mongo driver creating a native MongoQuery or even an in memory List for unit testing.
No matter how good another ORM may be for another language, what made C#s implementation better was Linq + expression trees.
There was also another Linq/ORM I used back in the day for Postgres. I can’t remember the name of it.