There was common agreement to set it to 0 in #7022 - apart from you. My impression was that changing the default has been discussed in many places including the IRC meetings and mailing lists and the outcome was the same. In general: Can we cut out this nonsense about default values? It's the same crap every time. I'm never going to merge mining/mempool related default change again. If people want a different value they'll just have to set it.