Currently Webflow HiDPI is a bit of a fake. You just upload a @2x image and call it a day.

True HiDPI would allow for uploading @1x images, @2x and @3x. It's been a year since the iPhone X came out, which has a proper @3x screen (unlike the previous iPhone Plus models which had downsampling). Webflow should natively offer multiple assets for the same element whether as a background image or a regular image element to allow for crisp asset rendering at the integer-value display densities.