IMHO the modelers worst enemy is the macro on your camera, if any flaws can be found the macro will find it and show it up as being a major blunder, also, we are our own worst critic, I have seen some brilliant models but the builder has nothing nice to say about it at all.
Talking about viewing your models from a distance and seeing what details can be seen especially turnbuckles, I am currently sitting at my computer and no more than two feet away is my display shelving, observing my models from where I am sitting they look really good, can't see any mistakes in the paint, can't see any dust, and most importantly, the turnbuckles have all but disappeared.
So, to the rivet counters turnbuckles are essential, to the casual observer I would say no, as I said in one of my earlier posts, I use them because I get a lot of enjoyment from adding as much detail as possible and making and fitting turnbuckles is all part of that enjoyment.
Des.