You are absolutely correct about netbooks being worthless for serious photo and audio editing. The little Atom processors are just too slow and the machines do not have enough free RAM for that. Even serious music notation programs will gag netbooks if you try to do too much with a file without saving and reloading frequently. While they are useful little things, netbooks aren't met for everyone, especially serious computer users. For me, even a laptop is too small. Some of my work processes need six windows open while allowing access to the trash can (dragging is faster) with two or more temporary windows popping up. Trying to work with sheet music or other professional documents on a tiny screen is a royal pain, especially when working on page layout. All that requires a large monitor (photo editing is also easier with a large monitor) and plenty of RAM.
I got my netbooks to use when traveling, mostly for web surfing, banking, and emails (they are called NETbooks for a reason). I don't really care for tablets and can't afford the data plans for smart phones. Touch screens and I do not play well together (the misbegotten things hate me, especially the older resistive ones). The same for touch pads (I've turned the stupid thing off on mine and have a little wireless mouse I use with it). The smaller screens are harder to use, especially with my old eyes, and not having a real keyboard is just too inconvenient. Tye also have too little drive space. For me, netbooks are a perfect solution. They are easy to use yet take up little room and add little weight in my luggage. When I had a vocal band that performed at Ren Fests in CA, I could make changes to our music while on the road if I needed to then take a PDF of the file on a USB stick to a copy shop and have them printed up. I also back up my camera cards on the netbook while on the road. Tablets and touch phones have their advantages but they just don't meet my needs.