While one might agree or disagree with what you are saying, it is similar to saying that someone might need a combination tool that has all the latest widgets. *If* you need the widgets, then this is a good thing. But for most welding jobs done in the repair end of things (what I do) all the widgets aren't needed or used. Dual shield and pulse I agree with, but it generally only applies with heavier welding, and it's been in my Miller gear for 15+ years so I am not sure what you are looking at. The XMT series inverter units do this, and are what I am using.
So where I sit, I have what I need and it has been rock solid. *If* I were looking at high production specialty welding, it would be with a robotic based unit, and the power source is a separate discussion.
To each his own, I like to own lots of tools, but then again I don't buy stuff that I will never use. Well, ok, maybe not too much stuff I will never use... <grin>