Re: Samsung s9+ without TalkBack (only Accessibility is enabled), and the option is visible.
Accessibility meaning - "explore by touch" and a voice tells you what you're touching?
What's the exact phone setting?
I should have worded that more carefully - we ask Android if "voice assisted touch exploration" is enabled, we don't look for TalkBack specifically, there could be other services providing the same feature.
The setting is enabled by default, if "touch exploration" is on - the "touch proxy areas" will be there, same as they've always been.