Begin with a user journey
Receiving money, moving it, and spending it are separate problems. A payment rail can improve one part while leaving conversion, custody, or dispute handling unresolved. Study the complete journey.
Stability is a mechanism
Understand the reserve or collateral model, redemption terms, issuer, and controls. A stable target is not a guarantee. The relevant risks differ between designs and should be examined individually.
What matters in practice
Fees, reliability, support, and clear error states often matter more to users than the settlement mechanism. A good discovery process asks what a product makes easier and what obligations it introduces.