In terms of digital vs "analog" systems, I think that for all intents and purposes, an "analog" system that uses descriptions and approximations is far superior to the precise numerical system. Unfortunately, the analog system is only useable in the type of games that are scarce nowadays, the games where you don't get to distribute any points between anything ingame.
As for applying it to DF, I think DF must only use the descriptive system, that will be a combination of ADOM's monster memory and DF's own Legends and Lore.
An example call to the resulting "Monster Lore" would be:
[giant cave spider seen from a distance]
"This is a giant cave spider. A large black spider with long legs. It is fairly large. It moves quickly."
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[giant cave spider seen up close]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly."
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[giant cave spider seen weaving webs]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly. It can make giant cave spider silk webs."
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[giant cave spider seen shooting webs]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly. It can make giant cave spider silk webs. It can attack by shooting webs."
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[having hit a giant cave spider]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly. It has a tough chitine shell. It can make giant cave spider silk webs. It can attack by shooting webs."
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[having been hit by a giant cave spider's leg]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly. It has a tough chitine shell. It can make giant cave spider silk webs. It can attack with its legs, or by shooting webs."
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[having been bitten by a giant cave spider, and subsequently paralyzed]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly. It has a tough chitine shell. It can make giant cave spider silk webs. It can attack with its legs, by biting, or by shooting webs. Its bite causes paralysis over time."
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[having hit a giant cave spider with a torch]
"This is a giant cave spider. A large black spider with six hairy legs and long fangs. It is fairly large. It moves quickly. It has a tough chitine shell. It can make giant cave spider silk webs. It can attack with its legs, by biting, or by shooting webs. Its bite causes paralysis over time. It is vulnerable to fire."
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[given a description of this specific cave spider]
"This is Procusrot Eblint, a giant cave spider. A large black spider with six hairy legs and long fangs. It is very large. It moves quickly. It has a tough chitine shell. It can make giant cave spider silk webs. It can attack with its legs, by biting, or by shooting webs. It is said that its bite causes instant paralysis. It is vulnerable to fire. It was known to kill at least 28 people. You have been given a task to kill it by Homund Implond, mayor of the town of Ertiglom."
Note that in the example, if you were immune to the poison when bitten, you wouldn't notice the paralysing effect, and it wouldn't be mentioned. If you are given a description, you will see "It is said that" before the relevant ability you haven't observed. These descriptions are overruled by your own observations.
I am not completely against numeric systems, but in DF, only the descriptive system is possible. The points distributed at the start are a necessity, and so far the only numeric bit I can see being removed is the visible skill progress in adventure mode.
Wow long post.