You are not voting to decide which candidate's electors get our state's votes. Your vote will be pooled with the rest of the country and the winner of the popular vote will get our electors."
Here's a great scenario: The popular vote is "too close to call". Lawsuits are intiated in 435 districts. Some states won't count absentee and disputed ballots unless they're needed. So now states within the compact are suing those states to force them to count them so the popular vote winner can be determined. The entire election sits in limbo for weeks. One of the compact states decides not to wait. To take advantage of "safe harbor" they must appoint their electors by 12/12. So they drop out. Now there are not enough states in the compact to determine the winner so the other states that joined are now no longer in it. Lawyers and judges pick the President. Rioting ensues.
Having the electoral vote go to the winner of each Congressional District with the 2 extra going to the statewide winner is more feasible. Gerrymandering would play a bigger role than ever and the party that went to this approach first for their states would be at a disadvantage. Hopefully conservative leaning states are more reluctant to make any of these types of changes, but I haven't seen the list of states that have approved it so far.