Task.detached doesn’t allow implicit self

Development Standard Library
2

I found an earlier post that noted this: Why Task { } doesn’t need explicit use of self?:

I think detached task initially wasn't required to explicitly mention self but was later changed.

Questions

  1. Does detached task have a self requirement because of how it interacts with actors (it doesn't inherit the context and could run on a different executor)?
  2. Is there a way to reliably detect data races? TSAN sometimes catches it and sometimes seems to miss data races. (not sure others face this issue or I am missing something)

Does anybody have a source where this was decided (if it was formally decided)?