I'm not going to actively seek it out, but if I were to get offered it in roleplay, I'd probably take it if it makes sense to the character. If you can do it, I'm sure I can.
I understand the concern. Though, given that it takes three emotes to cast the Flamespew spell to begin with and the two emote cooldown preventing fireball spam like you're in Mortal Kombat, I imagine that would give more than enough time for attackers to try distancing themselves from the Nephilim and by extension the fireball. If they do get hit while unprotected, they can be quickly doused and moved away from the flame. If the spell has already existed for a long time, and it hasn't become abused to the point of it needing to be forcibly removed I see no reason why it shouldn't be left in.