Initially I voted for this, but I think that if we can get some version of an early unlock process (similar to the proposal here: https://peakd.com/@thepeoplesguild/soulbound-reward-card-proposal-immediate-and-ongoing-accessibility) then I think there is still merit to creating soulbound cards to allow players to play with cards beyond what their budget may allow them to own, while not hyperinflating the tradeable card supply.
So I'm changing my vote to continue soulbound rewards, with understanding that it is expressly because I think there should be an early unlock process, even if it is more expensive than unlocking later.