Why in god's name would you ever need to grind in FFIX
Maybe because he's running a level 1 game challenge.
Or he misspoke and meant grinding in Chocobo's Hot and Cold.
I can't seem to figure out the game's skills system - is it supposed to develop that slowly??
I found the 8 bouts with Beatrix a pain in the ass. I also found experience sucked too often to really find the effort to grind.
Do you mean the AP system? I didn't find it that slow considering the average AP for a skill on a weapon was about 40 and bosses dropped about 10 to 15, and random battles average at about 2 or 3. I think if you wanted to do it faster you can try and find those little guys who are looking for opals, emeralds, diamonds etc and I think they give you 20 a pop.
As for experience, my favourite place to grind was in the Treano gargant system, as those worm/spider things drop a fair bit.