That solves the issue of waiting for confirmations but it also means zero innovation beyond what's already happening now. People already buy gift cards with bitcoins all the time.
Coinbase's ecosystem solves the issue of waiting for confirmations too. Bitrefill allows people to pay for their products with their Coinbase balance. It has nothing to do with Bitcoin this, pretty useless so to speak, and that applies to what Bakkt offers too. People can instantly use their debit card, PayPal, Google Pay, etc, in any of the Starbucks shops within the US, and that without worrying about taxation.
The only positive thing about Starbucks "enabling" Bitcoin payments is the free publicity that comes with it, but it ends the moment people actually walk into Starbucks and ask why Bitcoin isn't an option.