Amazingly, I feel the same way!
I've said again and again that I'll point out rule errors, and do not mind them pointed out to me. Tactical decisions are different.
Your "large monster moving" is a tad weird of an example to me.
How far away is he to begin with? 15'? Anything different removes the possibility of the rule oversight, so we'll go with 15'.
There are reasons to close in to 5' of the PC in such a situation. Say the chances of the creature hitting with his second attack are low due to the PC having a high AC compared to the creature's attack (and the creature could know that from previous rounds). By closing in with the PC, the creature will automatically force the PC to create an AoO should the PC do -anything- but attack. There are many reasons why a PC would do that (he's an archer, he's heavily wounded and need to drink a potion, he's a spellcaster, etc.). Since the AoO uses the creature's highest BAB, it's chance of hitting are 25% better. If the creature has a good reason to believe the PC will do so.. It's tactically sound.
While many DMs can be prone to forget many things, reach, in my experience, is not one of them. So if the DM decides to close in with my PC and attack him, foregoing an iterative attack, that is what I'll assume he figured. Then I'll decide if it's worth provoking an AoO.
But I sincerely believe I wouldn't be cheating by doing so.
I've said again and again that I'll point out rule errors, and do not mind them pointed out to me. Tactical decisions are different.
Your "large monster moving" is a tad weird of an example to me.
How far away is he to begin with? 15'? Anything different removes the possibility of the rule oversight, so we'll go with 15'.
There are reasons to close in to 5' of the PC in such a situation. Say the chances of the creature hitting with his second attack are low due to the PC having a high AC compared to the creature's attack (and the creature could know that from previous rounds). By closing in with the PC, the creature will automatically force the PC to create an AoO should the PC do -anything- but attack. There are many reasons why a PC would do that (he's an archer, he's heavily wounded and need to drink a potion, he's a spellcaster, etc.). Since the AoO uses the creature's highest BAB, it's chance of hitting are 25% better. If the creature has a good reason to believe the PC will do so.. It's tactically sound.
While many DMs can be prone to forget many things, reach, in my experience, is not one of them. So if the DM decides to close in with my PC and attack him, foregoing an iterative attack, that is what I'll assume he figured. Then I'll decide if it's worth provoking an AoO.
But I sincerely believe I wouldn't be cheating by doing so.