you're just repeating the previous comment

the point is that current measures of 'best' skew heavily towards certain race, origin, and background

if walking is so great, why does every semi-long distance end up requiring a car or bicycle?

how do you do inventory management? variants? promotions? etc etc etc

do NOT write your own shop. you're putting your friend in a shit situation when 1 year from now, you're too busy and she needs to find a contractor to add a feature on top of your custom framework, when if you did the right thing in the first place and built it with Shopify, she could find someone super easily