Keychat currently only has a Cashu wallet (which can also receive and send Lightning payments). We’re exploring a way to connect users’ existing Lightning wallets to Keychat, with Keychat serving purely as the front-end UI, while the wallet itself continues to run on the user’s own server or desktop. The main reason we’re considering adding Ark is that many users may not want to open and manage their own Lightning channels. We understand Ark’s trade-offs, and at this stage we believe they’re worth it.