Source engine, should you throw it away? (Half-Life 2)

I see Gabe Newell following Carmack's example in terms of engines. Carmack didn’t change the concept of geometry creation and Gabe didn’t change it either. I believe that in the course you need to change the concept of creating geometry to Anril's, that is, cutting out rooms from an infinite brush (CSG), so it will be much easier and faster to make a map. Yes, and it's time to remove the compilation to @ beny,
there will be fewer errors, like all sorts of faces aka Leak. And by the way, in this case, you can already see the result in the editor. + I would like to be able to test the map in the editor, as is done, for example, in the Serious Editor. It would be nice.