They don't want to give out specific formulas and values because it would make the game infinitely easier and more predictable... People already do plenty of calculations on their own ahead of time... I can open a spreadsheet on my desktop right now and tell you all about my cure amounts, magic damage, damage taken, DA/TA rates, TP/hit supposing various haste and spell effects, etc supposing I were to go obtain or buy various pieces of equipment... It makes it very easy for people to prove/conclude what is the "best" setup for various situations... No one wants that to happen, it completely ruins the game. And yet it's only natural that people continuously experiment and try to derive these formulas on their own, thus there are tons of wiki pages and forums scattered around on collective input and data analysis trying to figure this stuff out... there's still a limit to the amount of data you can divulge through experimentation as a player, and they want to keep it that way... I want them to keep it that way too, because I hate elitists who insist on having the best of the best and the most optimal setup all the time...
People already use Windower to automate their battles... let's say the complete details of the enmity system were given here... What's stopping anyone from making a Windower plugin that would just completely automate a whole battle dual-boxed such that enmity would be perfectly balanced at all times? Suddenly the whole game is just watching a program exploit another program..? Yay... what fun... short of this everyone will just have their alliances exact enmity values constantly displayed beside their names like they already do TP and MP... no wait, don't cast that cure, wait a few seconds for his voke, his enmity isn't high enough yet... LAME.