Well, presumably, SotC got its own playtesting. So, the bugs with the core system are, theoretically, already worked out.
And, the testing that scrapped the original version was alpha testing. Completely in-house. We haven't gotten a beta-ready rules set yet to test.
And, in my experience, playtesting is generally not intended to find big holes in the system. Those should have been caught and closed in alpha testing. Playtesting is intended to find weird broken combos, unclear rules, out-and-out mistakes, and, most particularly in this case, places where the rules and the setting don't meet up.
IOW, patience, grasshopper.