The larger block includes advancements that have not been activated yet like transaction malleability fix
Ready for Liftoff
Andrew Lee
7612

Is this being proposed as an alternative to SegWit, or in addition to it?

The wording here and the picture below appear to assume that the main-chain will have no malleability fix. Do you see any reason not to activate SegWit on the main-chain alongside your proposal, or any reason to delay SegWit until the time the extension chain proposal is designed, developed, tested and reaches consensus?

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