<p>I believe that was introduced so that certain CPUs can set the packet buffer size. Isn't this the case anymore? At least it is still defined this way for MSP430, native and NRF51:</p>
<p><a href="https://github.com/RIOT-OS/RIOT/blob/01fb5335a28551195c31b6c40a1a5185a46694a2/cpu/msp430_common/include/cpu_conf.h#L72">https://github.com/RIOT-OS/RIOT/blob/01fb5335a28551195c31b6c40a1a5185a46694a2/cpu/msp430_common/include/cpu_conf.h#L72</a></p>
<p><a href="https://github.com/RIOT-OS/RIOT/blob/01fb5335a28551195c31b6c40a1a5185a46694a2/cpu/native/include/cpu_conf.h#L58-L61">https://github.com/RIOT-OS/RIOT/blob/01fb5335a28551195c31b6c40a1a5185a46694a2/cpu/native/include/cpu_conf.h#L58-L61</a></p>
<p><a href="https://github.com/RIOT-OS/RIOT/blob/01fb5335a28551195c31b6c40a1a5185a46694a2/cpu/nrf51/include/cpu_conf.h#L60">https://github.com/RIOT-OS/RIOT/blob/01fb5335a28551195c31b6c40a1a5185a46694a2/cpu/nrf51/include/cpu_conf.h#L60</a></p>

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