You say refinements have been replaced with full audience functionality but i still see 'Audience Refinement' within each experience under location selection - is this that just for legacy?
Also regarding using targeting audience browser = Chrome AND audience refinement page = /support wouldnt this lead to more collisions? As your bucketing ALL Chrome visitors into the activity even though the experience will only be triggered on the /support page?
Ultimately my goal is to reduce collisions where for example one test may be aimed at improving landing page conversion to the funnel E.g. landing page to quote start. Another might be improving conversion with the funnel itself quote start to quote complete.