Yes, she's the best for para-train, I'm not gonna deny it (not necessarily true depending on element, but that's not important point here), but I saw people para-training with Mokosh in ranking (and there are even madmen doing it with Thunder Neith), so she's definitely not the only one in that niche.
What's the game changer though ? Because there are cases I think people would rather take Athena than TAphro.
Also iirc, the highest thunder place in last dummy event on DMM didn't have TAphro in his/her team.
SSR Amon is used in most fire teams. Fire Mammon is very good, but contrary to Amon, she needs some windup time to show her true power.