the Fluorite Solubility issue is just pure hype and BS promulgated by manufacturers NOT using fluorite. You literally need to soak fluorite in water for DECADES for it to dissolve even by a tiny percentage. I have owned MANY Tak Fluorites and I lived in near constant 85% humidity - not a single issue.
Tak has gone back to fluorite yet again after a hiatus making ED glass refactors, and TEC in the US is going to be making 140mm refactors in fluorite.
And just so you know, Willaim Optics refractors have never used fluorite. That was a BAD marketing ploy that cost them dearly - there are still many people who do not know that the "Fluorostar" and some other WO do NOT have fluorite lenses (they have FPL, which is NOT CaF2). Tak on the other hand are synthetic, lab-grown pure CaF2.
BTW, it is fluorite. Fluoride is in your toothpaste, and conspiracy nuts will tell you not to use it cause it'll turn you into an anti-fluoride nut.