They are viable for people starting afresh. Not everything that comes along has to care about legacy systems so the advantage goes to those creating new tools/p

They are viable for people starting afresh. Not everything that comes along has to care about legacy systems so the advantage goes to those creating new tools/products/services with the advanced approaches. In fact, I'd argue that such step changes wouldn't be possible if we always had to be compatible. This is pretty much 'circle of life' stuff.