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He stated his developers must know this not all developers.

Also any web app that is not using some form of OOP must be a very small or very confusion application (confusing to modify not use).

And even in the C# world LINQ is doing a good job of isolating developers from the details of working with SQL.

For simple apps, yes. But actually I was surprised to find out that they have been on and off plans in attempt to kill linq2sql and actually if you inspect the produced sql code(out of the box) .. well it can use a lot of optimizations.

I do think o/r mappers are the way to go, although having better tools does not mean that you should start handwaving when it comes to db internals.

It is, to use a Spolskyism, a leaky abstraction.

Maybe if all you're doing is writing silly blogging software, then you can get away with that. I need to develop apps the report live on nation-wide sales and inventory data, down to the individual shipment. You start dealing with a database intended to hold 10, 20 years of warehoused data, application languages turn into a blur in the background.

Totally not the point. C# is just an example of an application language. The point is that there is no reason why a developer can't master the full stack.