The original quote of mine that he was responding to was:
"It is obvious that a +1 to all saves through the life of the character is worth more than +2 to any single save. "
Are you telling me that over the LIFETIME of the saves of a an AVERAGE character, that:
1) He will eventually acquire a luck bonus that invalidates his Luck of Heroes feat.
2) He will survive to actually acquire such an item.
3) That the frequency of his least favorable saving throw will be greater than 50% of the time.
4) That many levels of his best saving throws being affected by Luck of Heroes will not compensate for his extremely high saves in his best saving throws at higher level?
Yes, extreme situations CAN affect this. But, the point is that 95% of the lifetime of a character, he is NOT in extreme situations like these.
So yes, this small 5% advantage on all of the saves IS more potent over the lifetime of the character than a 10% advantage on approximately 1/3rd of his saves.
Just like a character can acquire a luckstone at higher levels (a 10,000 GP item, about the same in cost as +3 Armor), he can also acquire other items that boost his worse save.
Plus, a luckstone doesn't work in magic dead areas, it can be dispelled, it can be stolen or lost.
Plus, most characters migrate towards situations which require their best saves, not their worst. So, Rogues migrate towards disarming traps and opening chests and doors where Reflex saves occur more often than Will or Fort saves.
It doesn't take much to realize that over the lifetime of a character, +1 to 3 types of saves is more potent than +2 to 1 type of save. Mathematically, I am correct and I doubt you will convince many people differently.