It probably made sense when it was written, but your comments about layouts is outdated.

No manual changes are needed.

try:
https://paste.kde.org/pgi2ui6e3

If it was a problem we'd be seeing it all the time in the config modules.

It is true for manual positioning and anchors, but I think the vast majority of the time where we'd want to be aligned to a button we'd be in a layout with that button.

I'm sure there will be some changes needed, but it'll be few. (if I remove the line in my QQC1 label locally, I can't see any)

In constrast run this on your workspace folder:
find -name '*.qml' | xargs grep 'height:' | grep paintedHeight

and you'll see the number of times we have to reverse this logic.