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Using transit debit cards (funded by pre tax dollars) which do not currently support being added to digital wallets, I think was going to be the best use case here. Similar to the Hop Fastpass app by TriMet (Oregon).
Either they're not taking those use cases into consideration, consider it a small enough group not to matter, or are expecting transit card providers (Benefit Resource Inc., Wage Works) to release/update/add-support-for-existing debit cards which will work with the digital wallets. This could put some pressure on them to do so. Just tried to add WageWorks Commuter Card (debit) to Wallet now, to make sure, and its still not supported.