Could it possibly be used to make SOAP? Something like MWAX+WATR+ASH=SOAP could be useful. As for other uses, it'd be a nice powdered heat shield.
No. They don't.
Exot didn't break saves, merc didn't break saves, vibr didn't break saves, tron didn't break saves, ligh, wire, emp, ttan, gpmp, dmg, tsns, bran, soap, elec ect. did not break saves when they got implemented. I don't know where you got that assertion from.
However on a technical level you're right: element suggestions usually end up breaking saves. That's why they stay suggestions.