what would you say to those who are less experienced though?
Same thing. It's up to them how they want to approach it. Most stick with the obvious first paragraph realities and use an indicator. You only get to the latter paragraph through practice and it doesn't really matter when you start. In fact an argument can be made that a beginner that hasn't been exposed to a lot of indicator fishing will have a shorter learning curve than one who has.
I know a lot of people in the sport with 5 seasons or more experience that have never really employed any method other than indicator nymphing. Heck, just watch the fishing shows. You'd be amazed how many think that indicator fishing
is the universe. If you took away their indicators, I think they'd have less confidence than the beginner.:)
Some of the first trout I ever caught on a fly were taken with dead drifting nymphs tumbled down deep into inlets where pods of rainbows were staging. sometimes you'd see a twitch, usually a pause, but after doing it enough, you'd often pull the trigger and not really know why you did. More often than not a fish would be there. Sierra lakes after ice-out are great for this and there are hundreds of them. On Putah creek, I used to fish the shallower pools with the leader butt greased and look for the twitch. All these experiences occurred in my youth. I'm not an "expert" now (whatever that means), and I certainly wasn't one back then.:)
Back to your original point though, I guarantee a lot of takes go undetected, regardless of method.