I am puzzled why anyone would need a high-tech "bike fit" except maybe a professional racer -- in which case perhaps it should be done in conjunction with power meter readings. I understand the cycling novice needs some common sense help. We have all winced seeing somebody panting and sweating like a hog with a saddle so low his knees are practically hitting his chin. But I question the point of the typical high $$ service such as offered at my LBS - a shop where I do a lot of business and for which I generally have a lot respect. I think it costs $150 and they use laser beams and digital readouts right down to a fraction of a mm! So now you adjust the bars to within 1 mm (or whatever) per all this high tech measuring, but what does it mean when road bars have 3 or more hand positions all of which are considered valid, and which are 100 plus mm's away from each other? Is it really that hard to set the saddle at the right height. look at your knees with pedals at 3 and 9 o'clock and then tweak to personal taste?
I think once you are in the ballpark, it comes down to trial and error and what you are comfortable with. Three years ago -- when I was only 62 years old -- I rode only occasionally and casually. I didn't get much other exercise. I got "born again" and now cycle maybe 100 miles/week, go to the gym 3x/week, and did a century + 12 miles the other day. During the last three years I have been dropping the handlebars on all my bikes as my core fitness has evidently improved. I used to get backaches unless the bars were 4 inches above the seat, but now I am happy to have them anywhere from level to 4 inches below the seat. (This is flat bars plus bar-ends -- I don't care for drops.) How would the high-tech, "accurate to 1 mm" fitting, have helped me with this?
Currently I have 5 bikes. None have been "scientifically" fitted, no two fit the same. I am always looking for bargain stems on e-bay, Craigslist and the local Frankenbike swap meet to add to my collection. I swap stems around and play with height until I like how a bike feels. I play with saddle setback until it feels good. Although none of my bikes fit the same, they all feel good to me, and, in fact, I find it refreshing and energizing to ride one I have been off for a while and which has different feel and fit than what I have been recently used to. It might seem a little "off" until I am 15 minutes into the ride, but then it is good.
If I am missing out I am happy to take under advisement an explanation of why this is so. Perhaps none of my bikes fit me and I don't know what I am missing, or perhaps they all fit OK -- just different? My personal opinion is that bike fitting is made far more complicated and difficult than it needs to be. I think there are so many variables re' the rider, that the hair-splitting scientific precision fit is an absurd premise.
Don in Austin