Officially, canonically, the numbers in the book are just a suggestion; they describe a hypothetical "typical" specimen, for whatever that's worth. You never actually meet a "typical" specimen, though. The ogres you actually fight tend to be stronger than average, for the exact same reason that the average orc you come across has above-average strength for an orc.
I said that I could run the encounter accurately from memory, and I can. I would have given similar numbers if I'd had the book in front of me.
That is not how I've seen things go at all in any game group I have been a part of. If you encounter an ogre, it has exactly the stats from the MM, with the exception of the DM maybe rolling the hit points instead of using the average. Not to mention that thanks to all the number increases you gave the ogre, it should probably be at least one CR higher.
The only reason an enemy would have anything other than the average scores is if that enemy has levels in a class, in which case it uses either the Nonelite Array (13, 12, 11, 10, 9, 8) for NPC classes or the Elite Array (15, 14, 13, 12, 10, 8) for PC classes as a base instead of 10s and 11s. This, by the way, is the case for the typical orc an adventurer is likely to encounter: the MM lists stats for a 1st-level Warrior with the Nonelite Array.
Fourth edition was better about giving numbers you might actually use, rather than the average values that were more useful from an academic perspective, but that's beside the point. This sub-thread is talking about abilities - monster powers - and how they work. If you tell me the name of a monster power in 3E, then I don't usually need to read the monster entry to figure out what it does. (There were always exceptions to that rule, of course, but they tended to be the obscure monsters that didn't show up much; and even then, they probably only had one unique ability, as compared to the three or four in the opening example.)
So off the top of your head, you could tell me the differences between the breath weapons of a Hell Hound (CR 3 medium creature) and a Wyrmling Red Dragon (CR 4 medium creature)? Those seem pretty common to me.
If a monster has a disease or poison ability, you wouldn't have to read the monster entry to figure out what it does?
You remember the differences between clumsy, poor, average, good and perfect flight maneuverability?
You can remember what the Wingover feat does? Or how Awesome Blow works? And you'd actually remember to check the feats to know the monster has these abilities?
And if you say you don't have to remember the ability exactly, why do you think you need to remember the ability exactly for PF2e monsters or 4e monsters but not for 3.5 or PF1e monsters?