More specifically, Muun is an on-chain 2 of 2 multisig wallet with an on-chain to lightning swap service. When on-chain fees are high, the reliance on swaps make the wallet unfeasible / not economical to operate, especially for small amounts; therefore, it directly affects the usability of the wallet. Muun will simply not be able to compete with other true native lightning wallets’ fees and will lose users as a result. That is why I said they need to adapt and change, or risk becoming obsolete.