May not matter to some, but a lot of it for ME is appearance. The BEST mig welded cage......well, LOOKS like a mig welded cage. I tig everything because it looks better. So if I am going to tig it anyway, I use moly, regardless of ET range
I noticed that I don't care for the appearance of a Mig welded cage, myself, anymore. I don't know if people just don't know how to do it right, or it just isn't appealing to me. I don't remember my Mig welding being that bubble looking, but maybe that's because I really don't care to Mig weld anything anymore.