It's not really minmaxing, it's just being efficient with my time. If I were minmaxing profit I'd be out doing exobiology.
Ideally, there would be a variety of different circumstances that would make mining anything ideal in the right circumstances. That is, by and large, already the case for a lot of things. Rhodplumsite normally isn't worth bothering with but is the best during Public Holiday. Musgravite, Benitoite, and Void Opals aren't normally worth bothering with, but become so during Pirate Attacks.
Like...here. Look at this list:
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Can you honestly tell me you'd mine Low Temperature Diamonds in this condition? Why would you ever bother, when every second you spend getting them is a second you're wasting not getting musgravite or void opals?