I surprised myself: I read the entire thread.
I have just recently got Roku3, set it up via Ethernet, and observed Roku's hotspot Oxnak reported. I am not comfortable with that, and I would like to invite the tech experts stating that wifi direct is no security thread to look outside the box. Please follow my thought.
1. if there is a wireless connection it may get compromised. I hope you agree.
2. having it listed among other hotspots lowers the bar from experienced hackers to beginners that may be tempted to get in.
2. what does Roku's remote control do? Funny, you say. It controls the box. That's why it is called a remote control. Once the connection between the remote and the box is compromised, _hypothetically_ control over the box may be gained.
3. now we do the math: you have control over the box + you have a wi-fi transmission channel = you can watch online television via my Roku3. And that's what my "household" mentality fears the most, in this case. This is what "security" boils down to to me, as a movie watcher. This may result in saturated internet bandwidth, my movies will start breaking up, losing sound, and I will not be getting the pleasant entertainment experience I've got used to.
Please don't try to discard this because "no one in their right mind" would do such a thing. People have been known to do things much less attractive than that.
I don't buy the statement that wifi direct is short range - my dual band wifi adapter can see 4 out of 5 bars two rooms down the hall from where my Roku is. I m sure my neighbours next door can see it, too. And so would wardrivers.
Oh, yeah, one more thing: did anyone wonder how secure the Ethernet connection between Roku and the router is? As someone mentioned here, the secure computer is with no network connections and no power (i.e., turned off). So, by compromising the connection to the router, and then - to your home computer, a real security breach may happen.