According to https://en.wikipedia.org/wiki/Fluorinert#Toxicity Fluorinert has to be limited to closed systems because it has "high global warming potential", it can decompose into a highly toxic gas, and "care should be taken to avoid contact with eyes and skin" (I'll admit I'm not sure how all this squares with the 'inert' in the product's name)

To me this sounds more difficult to use than mineral oil, not easier.