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This article authorizes a governance document, the Block Producer Agreement. It's intended to be a take-it-or-leave-it offer by the Members acting collectively and setting out what those Members want each Block Producer to do (and refrain from doing).
No Member shall serve as a Block Producer who has not agreed in advance to the Block Producer Agreement provided by the Members of this blockchain.
The Constitution is intended to be as brief as possible, and the Block Producer Agreement is potentially detailed. For that reason it was decided to separate that Agreement into its own document.
If the Constitution did not contain this Article, then the BP Agreement would be at best a nice-to-have rather than a must-have aspect of Governance.
It seems likely that Block Producers, seeking to signal their trustworthiness and attract votes, may agree to the Block Producer Agreement and also undertake additional promises. There's nothing wrong with BPs seeking to embrace a higher standard than whatever may be found in the Block Producer Agreement.
The method of agreeing is not specified. It's likely that the Ricardian Contract for the "RegProducer" system command, by which a Member registers themselves as a BP candidate, will include the BP Agreement by reference. If so, then the act of registering as a BP candidate will entail agreeing to the BP Agreement. If true, one might think this Article superfluous. But that is not so -- this Article raises the BP Agreement's status from a mere Contract to a Governing document co-equal to the Constitution itself. This gives the BP Agreement greater standing in cases of Arbitration; specifically, the BP Agreement like the Constitution overrule any Contract, should they be in conflict.
A link to the latest Block Producer Agreement should go here once it is published.
26-Apr-2018: added link to EOS New York Code of Conduct in the References section.
27-Apr-2018: added link to EOS BlockSmith Independence and Integrity Pledge in the References section.
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blockchain governance expert - active in the EOSIO ecosystem
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(all opinions are my own)