I fitted a mixer tap in my own kitchen with cheap M10 flexis that came with it, boiler about 1M away and the flow rate was dire, re-fitted with these and made a world of differenceThanks for posting the video. I imagine a lot of mixer taps do use M10 flexi’s.. possibly not easy to find ones that don’t?
https://www.bes.co.uk/copper-monobloc-tap-tails-m10-x-15mm-19800/