I'd have to go with firemaking (even though at one time it was my favorite skill and my first 99) The reason firemaking is a skill back in the day was due to lack of cooking ranges. So they had firemaking as a skill so people could do cooking, which went in hand with fishing. Made sense at the time, but is very much obsolete now and days. Also while I see your point on farming, I found that to be a cool part about it. It's something that took time. While I did grind out 99 farming back in 2011 it was still something I did between barrow runs or after I did treasure trials. I found it relaxing and enjoyable because it was something I didn't have to work on because it took time for stuff to grows. To each their own.