Shindo Labs XLR on Power amps

I wonder why Shindo Labs use male XLR connectors on their power amp inputs where female connectors is standard and why they change polarity of signals for their inputs means modding the standard a second time so no ordinary XLR cables could be used ?

Same with their step up transformers. Male XLR input connector where all other use the correct female connector for XLR inputs. Why is this?