I was wondering many times about the "Technology" category at the agencies since this category contains almost only computer-related terms. Even at iStock.
Since drilling a hole in wood, or making gears is also technology, the term itself covers many more concepts.
http://www.merriam-webster.com/dictionary/technology

It isn't just IStock, this has happened everywhere - for example the 'technology' sections of big newspapers and news sites, which are mostly about cell phones and laptops.  Besides being totally lame, it's already starting to seem awfully dated.

All the microstocks' category systems are pathetic and probably a complete waste of time.

I totally agree that the universal category system (that doesn't exist) is poorly organized.

I buy photos as well as create them and I NEVER use categories. When will the agencies learn that they are a waste of our time??

Yes, categories are complete waste of time.
However, an acceptable category system exists at SS, it's simple and quick, 95% of my images fit into one or another topic.
Categories like People, Food&Drink  or Objects are probably full, browsing them is useless, while cat. like Transportation contain several thousand images.