I was erring on the side of powerful with Sandstorm blast, as I am largely of the opinion that most of the other eldritch essences- particularly the lesser ones- are awful. Baneful? Hellrime? Brimstone? Ugh.
Unfortunately, I [and anyone working with an IP behind them] don't recognise that as a valid argument. If something is meant to use with existing material rather than replace it, it can't be significantly more powerful unless you also overhaul what you're considering underpowered.
Creating a no-brainer choice is bad design and will often be construed as lack of understanding on the part of the designers by those reading it [whether it was unintentional or not].
Mine is not so much a Peter Pan Complex as a Peter Pan Doom Fortress and Underground LairTM! Fae-o-matic Want a fae from folklore stated? Give me the lore and I'll do it for you! Le Cirque Funeste Evil Fairy Circus! Ray Bradbury, refined down to snortable powder!