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This gets a little beyond my technical understanding, but at the very least, such an extended exemption is a hard fork: if anyone running current rules sees one of those utxos get included in a new block, they'll treat it as invalid.
This then comes with all the trouble of a hard fork: how do we make sure all people running old software don't get forked off?
I see. So, they could have easily exempted them at the time but now we’re stuck with this?
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I don't know about "easily" but I think it would have been easier.
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