They highlight some nice touches here:

Giving users graceGiving users grace

After showing you your seed phrase, Family asks you to confirm the order of 4 random words. Get one wrong twice in a row, and a friendly bottom sheet slides up offering to let you review the phrase again.

Offline transparencyOffline transparency

Bitkey doesn’t just tell you you’re offline, it tells you how being offline affects you. An indicator shows when your balance was last updated, and tapping it reveals exactly which features still work, which are stale, and which are completely unavailable.

Translating the protocolTranslating the protocol

Ecash introduces UX challenges you won’t find on-chain or in lightning. When you generate a token that never gets claimed, you can redeem it yourself, but the mint has no concept of “yours” or “theirs.” Sovran names this action “Rolled Back.”

I'm looking forward to this series.