Not to be a bummer but there are several security flaws here. 1. Blind signing. No screen means you have to trust the software that connects to the internet, generally not advised. 2. Software based key management. If google/apple were to exclude the bitkey app, you just can't use one of the keys. 3. This is a multisig where the backups are fully controlled by Bitkey. No Seed phrase means no redundant back ups for you. The convenience is not worth the risk.