100 % agree. I'm currently in the process of deciding on a commerce option for my Squarespace site but these limitations even make me move my regular site away from Squarespace. Because of 7.1 I would need to redo my whole page anyways so this seems like the perfect time to leave Squarespace altogether.
Add point 18:
No upsell/cross sell option.
Is it too much to ask. It's been years since the ecommerce feature launched.