The other day my wife said to me "I have a 16 wisdom". I believe that she honestly believed this because she is a librarian with two masters degrees, one from NYU.
If you make any character under the current rules you will always have an 18 in one stat at first level. This is just insane.
The strongest man on earth cannot lift 3x his weight or drag 5x his weight. The most beautiful actress/model barely rates a 15 in charisma. No one with a wisdom above 14 would ever enter the political arena because s/he would be wise enough to see the pitfalls. The smartest rocket-scientest at MIT probably has a 16 intelligence.
I don't see the need for such exaggerated scores.
Why do we make the rules so that only the GODLIKE can survive?
I've always had intelligence equate to a IQ test score divided by 10
so a 14 means IQ 140, an 8 is an IQ of 80, barely above mentally disabled
the highest achievable by a human is around 21-23for n IQ of 210-230
I treat the other stats with the same view.
take the strongest current and you get your answers on what the caps should be for humanoids of standard stats.
for strength Hafthor aka the mountain set a world record of 1041lbs lift, in 3e dnd that would equate to STR 27.
so considering that I would say stat maximums are fine, but what I have a problem with is how high they start at, one fix could be to add a step to generating ability scores.
make step 6 become step 7 and insert one of these 2 new step 6's
step 6, choose 4 ability score reduce them by 1 point each.
option 2 (my favourite)
each stat gets a number, STR 1, Dex 2, Con 3, Int 4, Wis 5, Cha 6
roll 4 d6, reduce the abilities that are rolled by 1 each time they appear on 1 of the 4 dice.
this could 1 time out of 1296 mean that 18 turns into a 14 if they roll very bad, but most times this will result in the unique character that this system lacks