Slow boot time is definitely a valid point.
I also used to keep my cab pc offline, but then I just bought a decent wifi antenna and I wish I had done it sooner. I'm using Win 10 so I was trying to avoid the updates, but lo and behold I would still get that &$@!) "What's new with Windows" screen every so often. ...pisses me off. So I figured, may as well stay connected. Especially now that I've become a Steam connoisseur (for arcade-friendly games only, of course).