yeah, but that's the issue: hs and ps are both coded to the same size which happens to be 1rem i.e. 1rem hs would be ok if you'd had 0.8rem ps, and conversely

yeah, but that's the issue: hs and ps are both coded to the same size which happens to be 1rem i.e. 1rem hs would be ok if you'd had 0.8rem ps, and conversely you'd have the same issue if both were coded to be 2rem