Controls in mobile: some show outline, some don't

Please correct me if I'm wrong but afaik UI5 controls in mobile devices aren't supposed display the dotted outline at all (such as in sap.m.Button, .CheckBox, etc..) since there is no keyboard navigation.

However, there are controls that do show the outline in mobile regardless:

• sap.m.RadioButton
• sap.ui.core.Icon (touch the stethoscope icon)
• List items from sap.m.Select and .ComboBox, but the same doesn't apply to .MultiComboBox.
• Input based controls including sap.m.StepInput and .MaskInput... But .SearchField doesn't.
• sap.m.Breadcrumbs shows browser's native outline whereas .Link works as intended (no outline).
• sap.ui.unified.Menu items
• sap.tnt.NavigationList items
• Panel's expand icon (probably due to sap.ui.core.Icon having the same problem?)
• Dots in the footer of sap.ui.layout.ResponsiveSplitter
• And more ...

What are the criteria for displaying / hiding the outline in mobile? I believe showing outline in input-based controls is by design. But then, shouldn't SearchField also display the outline too when the user touches it?

What is the expected result?

Improved consistency according to specification.

What happens instead?

Inconsistency, confusing communication; mobile users don't know what to expect when touching a focusable control.

Any other information? (attach screenshot if possible)

E.g. in Chrome's device mode: