Schema does/does not need to be enabled for Profile

[noMarax]

Issue in ./help/create-journeys/use-case-business-event.md

Hi Documentation Team,

In the last slide of the video (5:33), we can see that one of the best practice is to define a "non-people based identifier" in the schema and "enabled it for profile". However at 2:30, it's indicated that enabling the schema for profile is optional.
Could we clarify if this is indeed only optional and if this is the case indicate it at 5:33?

Thanks,
Nico

[noMarax]

I think the last slide should say "and it's marked as primary identity" instead of "it's marked for profile"