The Hive conversion is coming in the next hard fork as far as I understand it today.
The reason for the multiple proposals is so the appropriate ones can be voted in based on how much budget is available. While a 100HBD/day proposal might be fine sometimes, times like this a much larger one is needed. In fact, multiple are needed with the current budget.
If only one big proposal was made, then it would drown out all proposals if it got approved, rather than selectively being able to choose the amount used.
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