If a person's release isn't good, when using the calculator, it will throw the calculator off. I will agree with that.
But, the same result will happen if a person's release slightly plucks the string and he/she doesn't realize it when bare shafting. The slightly bad release will throw bare shafting way off also.
If someone is going to use the calculator, they need to adjust, not just point weight, but brace height as well.
In my situation, the calculator for me is the holy grail. Because I shoot low poundage bows with aluminum arrows and combined with my 30" draw length, I want 1 1/2" of clearance between the back of a very sharp broadhead and the knuckle on my left index finger that grips the bow below the shelf. This is why I don't measure clearance from the back of a broadhead to the riser's shelf. Thus, the reason why I shoot 32" BOP arrows.
The calculator is basically a virtual "what if" program. With the calculator, one can pick the length of arrow they want to shoot and then plug in different point weights to see what's feasible. This can't be done with bare shafting. With bare shafting, one has to have the actual arrow and shoot it.
In my case, I would never have considered a 2212 aluminum arrow with a 75 grain point weight shot out of both bows if I was bare shaft tuning. The calculator let me play around with a 2212 arrow without having to buy a half dozen 2212 shafts first.
The 75 grain point weight is the lowest point weight threshold I can go with because there are 3 blade 75 grain broadheads out there and Muzzy has one I like.
There is one other lower spined full length shaft that comes in a 32" length or more. That is a 2013. But; in order to shoot the 2013 in a 32" length, with the calculator, I would need a 40 grain point weight with my 37# and 42# bows. This wouldn't work for me because there are no 40 grain broadheads.
The calculator will give someone the same results as bare shaft tuning, but that is predicated on the correct info being put in all the boxes in the calculator. One can't have the wrong info and expect a very good result.
In closing, I don't know how to do a screen capture shot, but I will put up my stats with my 42# recurve using the calculator with a 2212 arrow. Keep in mind, I weigh all the component parts of an arrow with a balance beam scale. If you have the calculator on your computer, plug in the numbers below.
Box #1: Arrow Shaft Size, 2212 X7 Arrow
Box #2: BOP Length, 32"
Box #3: Point Weight, 75 Grains
Box #4: Insert Weight, 31 Grains
Box #5: Footing, NO
Box #6: Nock End Weight, 22 Grains
Box #7: Fletching, 3 x 5"
Box #8: Bow Type, Generic Recurve (Blacktail not listed)
Box #9: Rated Weight, 42#
Box #10: Rated Draw, 30"
Box #11: Your (My) Draw, 30"
Box #12: Center Cut/Strike Plate Position, (-1/16)
Box #13: String Material Type, Fast Fight 12 Strand
Box #14: Personal Form Factor, (0)
If you run the numbers, the arrow dynamic spine and arrow spine are both 57#. What isn't seen is the brace height adjustment (7 7/8") which enables me to shoot the 2212 with a 75 grain point weight.