I'm kind of thinking the opposite. The more different ways you have to join metal the better. While I appreciated the ability of my Heliarc to weld aluminum and many other kind of metals and the fine control it has for welding some steel parts, the deposition rate is very slow compared to stick and MIG processes. I have very little experience with MIG, but I am impressed with its ability to produce high quality welds rapidly.
Totally agree. It all depends on what you’re welding. If most of your stuff is little brackets and such, I’d probably stick to TIG. But as PinHead says, there are times I need to lay down some serious beads and go to MIG or stick.