Tests run in authenticated spaces where the 3rdPartyID can be reliably
set for all visitors can benefit from consistent test experience
delivery across a visitor't devices.However, tests run on pages outside
of the authenticated experience, such as homepage, where a large number
of visitors are not recognized at the time of the pageview, but also
have a large percentage of those visitors who go on to sign in will can
see a very high number of visitors switching experiences on their next
hit of t...