Shaft Flex - Doesnt matter?

I was at the belfry recently and one of the fitters (the pro in my usual pro am group) said shafts are sooooo operated and misunderstood. Having just spent 120 on a shaft for my sldr i disagreed.

As part of his pga tutoring course he has access to a bunch of blank shafts with no markings what so ever.

I hit 10 balls with 5 different shafts not knowing what was what. The track man results where amazing. I got the most distance with the ladies shaft by 3 yards and the spin only changed by 200 + or -. Needless to say i was jaw dropped. He said its the same everytime he does the test.

We then done a similar test with the same flex but different weight. Shafts started at 50g to 115g. This is where the difference was. Each weight produced massively different numbers.

i also saw witg with my own eyes thw the results from over 10 pga pros and they all proved the same point