Between version 4.8.3 and 4.8.5, special header and spacing

Between version 4.8.3 and 4.8.5, you changed the operation in special header and spacing.
Since 4.8.5, must be added “0” to unused properties.
However there is noted “margin-top” or “margin-right” or …
If we use a property, it applies everywhere because the CSS element and margin.
Example: margin-top: 10px in administration = margin: 10px 10px 10px 10px; on the page.
So your theme is not maintainable over time?
How to correct on several sites?
How do I remember which sites and when I used these settings?
So shouldn’t you update your theme?
Cordially.