Even that's too complex.
If you're playing an ATP tournament, you do it with a maximum 90 square inch racquet that is at most 27" long. Borg and company could grind with an 80 sq inch head, so that's being generous.
Strings get measured for stiffness and must be no more than 150 pounds/inch. If you wanted to, test for roughness but we all know it's stiffness that is the key.
It really would be that easy.
A simple height measuring scale is all they need nothing complicated about that
then the ATP profiles would not have false information about heights it has atm
Stiffness in string testing is useless as it reflects nothing towards material composition,
behavior or dynamics infinetely more complex as many know that already.
Borg would stand no chance vs Sampras, Edberg, Becker, Mahut and even nutcase Brown let alone McEnroe
and thats is one main reason he retired, Macca. The reality is Nadal would not win anything with a 93, Fed and Nole can.
Examples of players for example using fair racquet sizes
Diego, Albot and Nishioka using 98 sq
Dimitrov using 93
Evans and Kohls using 95
For Women not that I care but Williams should not be using 104
but WTA uses faster balls and rallies dont last as long
hence so many GS winners (mood swings inclusive)
However women should be playing BO3 8 game sets