nice but now add volatility.
Bounty request for 100 DOT:
I request 100 DOT worth $1,000 to create $1,000 of goods or services for tokenholders over 6 months.
I cannot sell DOT or manage it in any way (it is still in treasury).
After 1 month the 100 DOT is worth $500.
Now I need to go and take another 100 DOT from the treasury to complete the mission or do half the mission.
Spend Proposal for 100 DOT:
I request 100 DOT worth $1,000 in a bear market.
I sell 100 DOT for $1,000 immediately and create good or service.
The difference is the ability to manage the assets. In a bounty, the risk of volatility falls on the treasury. In a spend proposal it falls on the proposer.
This is why stable assets in the treasury would make Bounties superior, but until then they appear wasteful in practice.