What stuff really grinds your gears when it comes to technology here are some of mine.

1. The trend in non user replaceable batteries. For phones that you upgrade every two years it's probably not that big of a deal since the battery will outlast your contract but, for a $1000 laptop like a macbook I would find a way to make use of it until the thing was completely dead. If the only problem with a device is the battery I would like to be able to replace the battery without taking the entire damn thing apart. Is that too much to ask? Also what if the thing is hard bricked? What should i be forced to wait until the battery drains completely?
2. Glossy Screen Trend: They are good for movies and games but for real work I don't want to see my face staring back at me. Matte Screens are so much batter for long use and actual work.
3. Companies removing functionality that users come to expect. I bought a nexus 7 thinking that it would be great because I could download drm free video files and just copy and paste them onto the device from my linux machine. Oh and why would I expect that? Oh I don't know maybe the fact that I've been able to do it on my phone which runs the same os for the last 2 years. Mass Storage is quicker for file transfers period and it is also universal no matter what os you use.

Sorry just needed to rant.