Falling Icicle
Adventurer
I wouldn't have a cap, but I would make things that increase ability scores very rare.
The monsters you list here could pretty much have any strength score you want to give 'em. They're certainly not restricted to the same limits as Humans and just as certainly don't all have to be the same.As I mentioned earlier, if the cap is close to PC starting values, then it becomes harder to describe many monsters using ability scores. That was the case in AD&D, and it was problematic when spells and effects targeted an ability score, like ray of enfeeblement or some poisons. What was the strength score of a titan, a huge dragon, an apatosaurus, the tarrasque, and Zeus? All had a 25? As said by others, caps have the side effect of sameness near the cap.
Real World lifting capacity, using the lifting capacities for Strength Scores in 3E and 4E, put the strongest real world man at 23, and the strongest real world woman at 21. I could even see the argument for slightly higher scores in a Fantasy Game, though higher than 25 really stretches the bounds of believability for me.
But if you believe that lifting capacity is the definition of Strength, and you want them to be realistic with the real-world, then why cap at 18 (which isn't a realistic limit)?
The monsters you list here could pretty much have any strength score you want to give 'em. They're certainly not restricted to the same limits as Humans and just as certainly don't all have to be the same.
Side note: one big mistake 1e made IMO was not to give strong creatures e.g. Giants their strength bonuses in combat.
Lanefan
I don't see that the numbers in the game need to correspond with any real world measurements of Strength, Dexterity, etc, the numbers themselves provide differentiation without reference to the setting. Therefore I'm fine with ability scores being within a certain defined range if it improves the overall game experience.
If my campaign is based on the Brian Jacques stories I can define the average strength of a mouse as 10 without going into paroxysms that rats and mice are generally not as strong as a human. Similarly in a superhero campaign, I think it's fine to assume that everyone is automatically physically superior to non-superheroes, even if they've only got a 10 in a stat.
Kinda curious what the numbers on real world lifting capacities you're citing are.
Unfortunately this is an area that D&D rules model poorly, so it's unlikely that we can really say, "The maximum score for a human in reality is X."
I doubt, for example, that a weightlifter would retain a "Dexterity Bonus to AC" when lifting their maximum weight. In fact walking at all seems to be virtually impossible when lifting that much weight. So it's arguable this scenario would be covered under the clause that allows creatures to lift up to double their heavy load value (Ref). Thus a Strength 18 human would be able to lift up to 600lbs but is effectively immobilized by doing so.
Not too surprising that it would work out this way, since it's more than likely that the designers of the encumbrance chart used actual weightlifting records in the real world (rounded off) to benchmark what an 18 Strength would be in D&D.
As to how I determined real world Strength scores in comparison with D&D: I used exactly what the D&D designers did - real world weightlifing records (rounded off also). Which puts the current female weightlifting record holder at 21, and the current male weightlifting record holder at 23...
Well I don't want to get too much into this but you continue to assert this as if it were fact and I don't feel like you've really demonstrated that it's the case.
D&D doesn't have rules for a clean & jerk or any other extraordinary but unsustainable effort, but it's pretty clear those guys don't retain any agility when they're lifting that much, or even retain the ability to breathe normally. Definitely seems to fall under the lifting rules IMO, putting the world's strongest man at 18 strength and the world's strongest woman at 16.
In fact, the more I read about all these changes people want to see, the more I think that if even 50% make it into the game, this won't be the "One Game" to bring everyone together. No +n weapons, no alignments, etc etc
I tend to get the same feelings. But then that seems to be the disconnect between early editioners and later editioners.