Ohhh damn. The reaction system looks similar to what I suggested about half a year ago, though with something this robust (even splitting smites by level), it had to have been in the works for far longer. No wonder it took so long to implement this.
With level 5 and third tier spells being added, this also means counterspell is in. That's going to be the real question mark on how truly robust the system is if you want to automate it. Though I suspect everyone's just going to have counterspell on prompt by default because such a thing is too important to leave automated.
