I want an Apple Pay replacement rather than another crypto app
Crypro is dull but having the ability to store debit cards, loyalty cards, tickets, etc. would be super useful on a daily basis. What would even more cool if I could use an independent solution, which works across ecosystems and has the same experience on both Android, iOS and other platforms. A de-Googled Android phone for example would be hugely better with that.

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dolphin-cobalt-ridden commented
I agree with NFC payment. The lack of a FOSS Apple Pay / Google Pay alternative is something that's been hard switching to GrapheneOS, since mobile NFC payment presents a bunch of security and convenience benefits.
Whether it's in Proton Wallet or in a dedicated app, this is a feature I would be very excited to see from Proton.