I run a collocated Raspberry PI and never had a networking issue (it's monitored). I also ran one at home as a vpn server (slow) for a while and it also was mighty stable. I'm willing to bet that most networking issues on the pi can be traced back to crappy power supplies.
Yes, I have one myself and it's a great device. I also use it as a portable HDMI montior but the keyboard makes it a bit cumbersome. But they are getting harder and harder to find and also the new found interest seems to be driving prices back up.
Sure, because streaming high bitrate 1080p video works no matter where you are.
I don't know about owncloud's news app but tt-rss is a bit much for a PI to handle.
Not to mention that they still add 16Gb of (sometimes unexpandable) storage to those devices basically forcing you to watch low resolution/bitrate content on a high-end screen.
Add a small subroutine to all drones to home-in and destroy a jamming transmitter.