I mean, physically speaking, unless you are deliberately going fully Procrustean on your computations, there's no way to really avoid those types of micro-archi

I mean, physically speaking, unless you are deliberately going fully Procrustean on your computations, there's no way to really avoid those types of micro-architectural side-channel disclosures. It's a trade-off. Either you get the computation result faster (but you have side-effects that can be measured as an alternate form of info disclosure), or you trade some minimum possible execution time to gain fewer side-channels through which unintended disclosure can happen.