It seems to me all this would do is encourage 0-transaction blocks, crippling 
the network.  Individual blocks don't have a "maximum" block size, they have an 
actual block size.  Rational miners would pick blocks to minimize difficulty, 
lowering the "effective" maximum block size as defined by the optimal size for 
rational miners.  This would be a tragedy of the commons.

In addition to that, average block cinfirmation time, and hence rate of 
inflation of the bitcoin currency, would now be subject to manipulation.  This 
undermined a core value of Bitcoin.

> On Fri, May 8, 2015 at 1:33 PM, Mark Friedenbach <> wrote:
>   * For each block, the miner is allowed to select a different difficulty 
> (nBits) within a certain range, e.g. +/- 25% of the expected difficulty, and 
> this miner-selected difficulty is used for the proof of work check. In 
> addition to adjusting the hashcash target, selecting a different difficulty 
> also raises or lowers the maximum block size for that block by a function of 
> the difference in difficulty.

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