The UI/UX usually sucks a lot. Bitcoin wallets for example, suffer a lot because the average user doesn't have much of an idea that they need a strong password

The UI/UX usually sucks a lot. Bitcoin wallets for example, suffer a lot because the average user doesn't have much of an idea that they need a strong password or what these random numbers mean other that they might behave like bank accounts. The ideal decentralized UI/UX will work largely by copy paste, with human readable names (@me@mastodon.social, for example) and doesn't have too many buttons that need more than an icon or single word to explain them. On top of that it also needs to look modern and neat while being fast and snappy on mobile devices without sucking up battery or limiting how the users can interact (ie, not possible to share photos directly with the app is a no-go) These design limitations are solved more easily by centralized services as they can just throw money at it.