Learned to trout fish many years ago via my father-in-laws method, dare I say, rolling worms/corn along the bottom of the stream while split shot weighted. Started fly fishing about three years ago and started by nymphing on the bottom also while weighted. Then, the local fly shop owner where I do business told me that I'd catch more if I used indicators while nymphing. So, now, depending on the water conditions, it's either indicators, no indicators, bottom weighted, not weighted or a combination of some or all of the above. I think you have to adopt to the stream conditions and be flexible. I personally still like to fish without indicators; but, sometimes it's just not possible.