Why though? These numbers are all arbitrary. I hated how, in WoW, it got to the point where people had gear adding 100s to their stats and they were one hitting for several thousand damage. It's like it's there to satisfy ... well, people who are easily satisfied.
Well, 9999 HP, 9999 damage, 999 MP, level 99, those are all iconic maximum values associated with Final Fantasy. I think the fact that almost every numbered FF game up to XI had the same 9999 thing going left some of us a little disappointed that it didn't go nearly as high for XI. You're right though, with the smaller scale, every point counts.
It makes sense though. Getting those all-9 maximums comes from spending way too much time leveling your characters, and there's absolutely no need to have them that high to finish any Final Fantasy. Though the number varies, level 65 is typically the most you need to beat the final bosses. In a similar fashion, FFXI ensures all the values associated with maximum level are "just right" for endgame situations, as opposed to crazy overpowered, which is why none of our attacks do 9999 damage or even come close to it.
~6000HP and melee damage in the hundreds aren't arbitrary numbers, they are usually what you see at level 65 in your average Final Fantasy game, which is why he mentioned those. Then again, 999 is usually the maximum MP value, and we can go past 1000 in FFXI, so maybe that's some compensation.
WoW is a different story though; those numbers only seem arbitrarily high because it scales stats differently and puts a different weight on HP and MP. But notice how, because each point in a stat is not as well-defined or crucial, gear selections are much more flexible. It's not until you have the endgame Tier sets that there is a distinct "best" gear you can wear at a certain level, whereas in FFXI you can most certainly point out the best piece of gear for any slot at any given level, with some minor wiggle room when it comes to playstyle choices near endgame. That's not to say WoW's system is better, but there is more to their scaling system than just having big numbers for the sake of it.