Li Shenron
Legend
One of my pet hates about 3E and 4E is the inflationary pressures caused on the system by ability score increases.
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I like having ability scores - they're one of the things I consider a sacred cow of D&D - but keeping them mostly in the range of 3-18 would be something I'm in favour of.
Yours is a legitimate concern. There is no amount of training that could ever make a human being stronger than an elephant or faster than a cheetah. Humans compensate these "inferiornesses" with technology, which in a traditional D&D setting would probably mean "magic".
Unfortunately that's not what many (most?) gamers want. They want to play superheroes who go well beyond human limits. And it seems to me that a certain cultural idea that "humans are limitless" has become quite widespread in the past 20 years, and not only related to RPG...
If D&D wants to supports both, what do you think it would be best? To allow superhuman attributes since the start and make it up to the DM to ignore/ban the possibility, or to make them as an option instead? (Yes, it is a rhethorical question)
In addition, do we really need them for monsters?
I think we do, although exact numbers could be replaced by a range. In a monster's case it is better to have this sort of indication written in the book rather than let the DM make it up, although it is very hard to imagine what an Int higher than 20 really means, and how 20 is different from 30. If no mechanics needs to know the Int score explicitly, then I suppose the book could just provide a category for whether the creature is repetitive as a bug, animal-like, dumb but human-like, average human-like, clever or beyond humans. But I would not let this information totally blank, I think it really is an essential defining characteristic for the DM to use a monster in the game.