The XCM v3 implementation of BuyExecution does not make use of the newly introduced JIT fees withdrawal. (e.g. used via take_fee here in ExportMessage)
Why is that?
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1 Answer
Because the one responsible for paying the fees isn't always necessarily the origin.
Recall that you can fill up the holding register with assets via a couple of instructions, they are:
WithdrawAssetReceiveTeleportedAssetReserveAssetDepositedClaimAsset
Of which the only instruction that takes fees from the origin is WithdrawAsset. For all the other instructions listed, it is most often not the case that the asset being put into the holding register belongs to the origin.
