[chrchang523]

Note that my advice, if followed, has the effect of giving the OP's engineers more space to develop efficient implementations than they would probably get if OP acts on their instincts.

This is not a coincidence. If you look at my own public work at e.g. https://github.com/chrchang/plink-ng/tree/master/2.0/ and https://github.com/grailbio/base/tree/master/simd , you can see that I play the role of the "not yet smart enough" engineer, not the manager.