To my understanding, doing that wouldn't be helpful due to hard technical limits that can't be reconciled. Most window chrome themes are Aurora themes, which do

To my understanding, doing that wouldn't be helpful due to hard technical limits that can't be reconciled. Most window chrome themes are Aurora themes, which don't play nice with HiDPI, and to change that they'd need to be rewritten as C++ themes (like the default Breeze theme is), which is beyond the capabilities of most people publishing themes.