It started as a conversation about developing tailors bunion and why it is called that, and after a bit of research I found that tailors used to sit in this fashion and that is what formed the bunion. I looked a little further as to why tailors sat like that and all I could come up with was because it was customary to sit close to windows. Is that truly the only reason or am I missing something?
Tailor here - before electric lights were invented, we sat in the window to catch as much light as possible. We sit crosslegged because it's comfortable. A lot of people like to have a cushion in their lap to support their arms and upper back while they work by hand, and it helps minimize the chance of developing injuries.