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op_ctv. Combined with CSFS it can do eltoo and other things like non-interactive lightning payments (as in receive lightning while offline)
No matter what covenant proposal you support, we need covenants to scale. You may have heard about how it would take a year or whatever to on-board everyone onto lightning plus all the open and close channel txs. Eltoo fixes that by enabling channel factories, but the original BIP for eltoo (BIP 118 APO) also enables covenants. So no matter how you look at it, we need a BIP that enables covenants to scale.
tldr: Want Channel Factories? You need a soft fork.
Man, how interesting it is to understand all these issues. And it doesn't get boring. Thanks for the comment, a lot of it I didn't know yet.