I did point out at the beginning of my ranting that my largest frustration with this was the missed opportunity to do it right. I think that's something those of us who went through the healthcare debate can understand easily.
Legislation requires political will, capital, and money. If it's being spent on a sub-optimal solution, it's not being spent on better solutions. This particular plan has taken five years and an untold amount of money to get half the EV's they need. That work and cash might have otherwise been spent to fix the actual, serious problems in representation of the electoral college, rather than put a band-aid on top of a gushing wound. People get nervous when their elected representatives tinker with the underpinnings of Democracy too frequently, which creates a refraction period for further legislation.
It's just frustrating. You're also going to see increased scrutiny over legality issues, now. Before California it was mostly small states in support of the plan, but now it's non-ignorable.