The idea is to commit to a dev fund, but give miners continuous input where to direct it. A basket of plausible development orgs could be hardcoded. In each block miners allocate the 20% among those orgs in whatever ratio they want. The idea of “Burn” is to give miners an opt-out ability too… though its opt out by giving the 20% back to coinholders through less inflation.
This is similar to other dev fund proposals like
and Dev Fund Proposal: opt-out mechanism for sharing block rewards by miners for dev fund
The main difference is that the latter proposal lets miners vote MIN (all reward to miners) instead of “burn” (less inflation but no additional reward to miners).
This is compatible with the idea of opt-in as explained by @acityinohio here:
The future of Zcash in the year 2020