What features else is there to be added if not the ability to send Bitcoins through the Lightning Network for cheaper and faster transactions, plus as another layer of privacy as well.
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Any demand for Lightning transactions added will encourage the growth of the Lightning Network. It's a win for Bitcoin.
I agree this would be awesome. It's likely multilayer payment support would come to "Wasabi 3.0" in the form of transferable coinjoin credentials. Basically, this would be non custodial ecash that expires and must be claimed on chain. Ark pairs nicely with this.