The measurement you described is important for shaft length only. I don't believe you can call it a true fitting if that's the only measurement the pro takes when they sell you clubs. That's for beginners.
The dynamic fitting isn't just for pros. The fitting is free if you end up buying the clubs so why not do it? If you're doling out serious money for mid-range to high end clubs, you'd better get a dynamic fit with someone who knows how to use a launch monitor. You can fiddle with your swing to fit your clubs, or get a dynamic fitting to get clubs that fit your swing. Easy choice.