While inspecting tablet layout refinements here, I noticed that changes to font-size on the OS level aren't honored in the editor – both on iOS and Android.

Steps to reproduce

1. Type a bunch of text in a Paragraph Block, preferably something in multiple lines.
2. Go to OS-level font-size settings, adjust to very large size.
3. Go back to Block Editor.
4. Notice that font-size is still 16.