For those afraid of such pets like Eremes , it's not that easy to obtain them, the difficulty, effort, time and pots to be able to kill Eremes single-handed, or let's say you're farming with a group, the drop rates are really really low. Not to mention, when you open the fragments, there is always a chance that it turns up the same letter fragment.
Eremes is a really helpful and strong pet to have, but be mindful how hard it is to obtain one. Plus, having this pet will help kill raid bosses that seems impossible before (for most of the community anyways). This is the luxury of those who are skillful and diligent enough to farm the dna required for it. So being that said, having eremes for any person to be used in Colosseum or Raids is just fine.