I'm glad you like OSCARs! I totally agree, incentives are different. Well you have now tested both and look's like hiring hasn't work, maybe next time? I'm sure the right candidate will pop up with some amazing PoW through the OSCARs.
Bounties are only one part: I also understand people can submit new features and actively contribute. If aligned with yours and the community vision, they could go merged or not. It will be nice to have community members voting on features requests coming from the community itself