The same thing happened when they came out with the 255EXT. They kept the 250EX in the lineup as there are a lot of people that preferred to have the knobs. It is nice to be able to see all your settings in one glance. For some it's a big deal. I don't really care, one way or the other, except that I know pots get dirty over time and need to be cleaned to have smooth control. Of course membrane and tac switches have a lifespan, too. Before CNCs had cycle counters and spindle hourmeters, you could tell how much one had been used by the condition of the cycle start switch. If there was a hole worn in the touch panel and all the lettering was gone, you know the machine had a hard life.
It was mentioned some time ago that Everlast has been moving to all digital circuits, but has left the analog user interface on some models for those that want their knobs. But inside it's a digital welder. The best of both, the worst of both? I guess that's up to you.
You should have no problem running 6011, just try a few brands until you find what works best for you. Inverters in general require slightly different techniques with fast freeze rods. No big deal once you get the hang of it.
Long arc, short arc, heliarc and in-the-dark!