Q: Advice I saw: register every event parameter as a custom dimension to be safe. Sound?
A: Risky myth. Each registration has hard quotas and a permanent cost.
— You get only 50 event-scoped custom dimensions per property — burn them on junk and you can't add the one you'll actually need.
— Registering does NOT backfill history: data only flows from the registration moment forward, so 'just in case' gives you a gap, not a buffer.
— Register at Admin → Custom definitions, and only for parameters you'll segment or filter by.
Unregistered parameters still sit in BigQuery export, so nothing is truly lost.
TL;DR: Custom dimensions are scarce and forward-only. Register on purpose, not 'to be safe.'
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Q: Advice I saw: register every event parameter as a custom dimension to be safe. Sound?
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