There really isn’t enough info on how mobs act/react to really consider any of this IMO. Just from watching kToS streams, videos and reading the devblog it seems like outside of bosses it’s mostly centered around mobbing/AoE grinding rather than 1v1 encounters or strategic team based endeavors. How would they even be classified realistically? Level range? HP? Skillset?
Taking into account your “epic” monsters are just single unique monsters they’d just be camped, their skills will be recorded and they’ll be strategy guides by the time the first fight is over simplifying it to a ridiculous degree.
It’s not a bad idea just not one that seems to have much thought behind it considering we don’t even know what most bosses will be like considering fighting a level 60 boss or so isn’t even a high level boss, you’re still in early game as the game may have levels reaching over 400 during the full version.