Multiple Arbitrary Beneficiaries to Reward Payouts (needed for Busy's imminent launch)
The bold is not really true. Economic incentives for clients, etc. is more of a longer-term issue, particularly given the low price of STEEM and accordingly the low total value of rewards (and in turn the value of the small slice of that a UI would receive). I'm not sure that the Busy team would prioritize implementing this in the first public release even if the blockchain supported it (likewise for other clients)
It's not technically needed, true. And like you say, I don't know if Busy.org would implement it from the get-go. I'll ask. Edit: According to ekitcho, it's not a big immediate priority, but they are counting on the change [as part of Busy's model].
In any case, this is one change that gives more potential to Steem as a platform sooner rather than later because there are front-ends in the works that would benefit and be incentivized by it.
No doubt, I think it's a great addition.
Agreed.