Zardnaar
Legend
You can see it in the books. It's based around wealth by level and the magic item compendium, coupled with the NPCs magic items per level in the DMG, you can see the stuff match up. You can also look at the MM recommendations for AC by CR, which are high for PCs unless they have magic weapons.
A CR 8 creature should have an AC of 21. Lower if it's harder in other areas, and higher if it's easier in other areas or you want a hard encounter. An 8th level fighter has +8, around a 16-18 strength for +11 or +12 to hit on his first attack, and +6 to +7 on his second attack. He probably has another +1 from feats, but without a magic weapon he's still going to have a high miss chance for his first attack and will probably miss his second attack.
If we assume +13 to hit at 8th level(BAB, Str and feat), he's going to miss 35% of the time with his first swing, and 60% of the time with his second swing. And remember, AC goes up by one per CR, so even though BAB matches that increase and you get the occasional strength boost every 8 levels, the third and fourth attacks will be worthless if you don't periodically increase to a +2, then +3, then +4, and finally +5 weapon. Again, look at the NPCs and item level charts in the Magic Item Compendium.
This stuff is baked into the math. It's just not as front and center as the 4e math which is told to you more directly.
MIC is a later book. I remember they were thinking about things like that leading into 4E.
Its not in the DMG, MM and they revisions to monsters were sanding down 3.0s rough edges eg DC 50 fort saves vs poison. 3.0 they often took 2E monsters and slapped on ability scores.
Late 3.5 they were thinking about it. MMIV onwards the prototype 4E books.
The ones with small print ones and obscure even then (check out the prices on various late 3.5 books now).








