Every other ORM is bolted on.

For instance if you write the following using LINQ:

var x = from c in customers where c.Age > 65 && c.Sex == “male” select c;

var results = x.ToList():

If customer represents an in memory list, it gets translated as regular old compiled code.

If customer represents a sql database table - it gets translated to SQL and run on the database server.

If customer represents a Mongo collection. It gets translated to a Mongo query.

Of course you can do stuff like switch out what customer represents at runtime and it will be translated appropriately. You also get autocomplete help and compile time type checking.

You can pass the where clause around:

var expression = c.Age > 65;

And pass it into a method.