It is a necessary evil. In any way, witnesses are performing the function of leading the community. In fact, many a witness have come from among the community heroes. If they can shoulder an additional responsibility, the whole blockchain could benefit.
An important point to consider here would be that many of them are doing some of these functions already. Designating them would fix responsibility and get things done.
It wouldn't necessarily mean it's centralized. It'd just be a distributed Democratic Republic.
Having a governance structure does not mean centralization.
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