Look, you can still map in Radiant... Shits sake, they haven't removed mapping in GTK completely and you CAN convert brushwork from Radiant to and ASE thus making HD render your map as a model. Its not a big a fuss as people think it is, Surfs are now rendered in batches from the GPU too so in all models and brushes are rendered the same, just like they are now just a heck of a lot fast.
Which now gives us the ability to add a lot more detail weather it be brushes or models. I got NulL to clarify this for us, to be honest... I'd take NulLs understanding of mapping over Frankie's (no offense to Frankie)
Honestly there's no NEED to switch to Max, sure it might be a lot easier and we can add a lot more detail more easily than before, but thanks for bringing this up cause I've investigated and found I can stay right where I am
We can just use those really tris expensive models we've always wanted to use from random online sites