From what I've seen, many OW spiders seem to become less defensive outside of their enclosures and I'm not very surprised when I see people handling them. People who know what they're doing and don't attempt to stress the spider out seem to do fairly well handling them.
I've thought about my reasons for not handling before and what I've concluded is that handling a spider isn't what I enjoy about the hobby. Touching my Ts or feeling them walk on me doesn't do anything for me. I prefer watching them in their enclosures anyday to watching them crawl on my floor, bed, table, leg, etc. Since they don't need to be held and it's not something that I enjoy doing, I leave them be.
Seeing one T dropped and killed also helped me decide to continue not handling mine. It was done by an inexperienced teenager who was trying to show off, but it still really bothered me.