proximity sensors: begin with the application requirement

Before comparing options, define the operating requirement. For proximity sensors, the team needs a shared view of the real operating requirement.

The practical details are usually more important than the label: the use case, mounting or integration context, expected signal or outcome, working conditions and validation method. 

Engineering validation remains necessary, while this gives the discussion a clearer starting point. Verify individual specifications and suitability against current documentation before committing to a solution.