Should unattributed buyers disappear from the channel report?

Keep an unknown-source category and report its size. Direct navigation is an observed journey; missing tracking is a measurement limitation. Treating both as the same channel can make every other channel look artificially precise.

Use the payment ledger for the total and observed journeys for the channel breakdown. If tracking coverage changes after an instrumentation fix, mark the date. An apparent channel lift might partly be improved visibility rather than newly created demand.