I have question for you pro's, RT-AC3100

So I have At&t fiber, 1000 down 1000 up. I hated using the At&t GW, always caused issues when using my ac3100 in DMZ pass through mode.

So I stumbled upon a fix that people call it the "Dumb Switch Method"

So I copied the Mac address of the att gw to my ac3100 and proceeded to use a dumb switch to just use my ac3100. Well everything work perfectly, no issues at all have been up and running now for about 2 weeks and I have no issues.

The question is what are the pro' s and con's of...

I have question for you pro's, RT-AC3100