One of the things that could make this the most important presidential election in history is that there could be an unprecendented number of Supreme Court nomi

One of the things that could make this the most important presidential election in history is that there could be an unprecendented number of Supreme Court nominations in the next 4-8 years. That, to me, is what makes this such an important election since the SC has, in my opinion, been stepping beyond its power in the last 10 years so the utility of nomination becomes even more important. Other than that, you're right, House and Senate control is far more important. But don't underestimate these god-awful presidential signing statements that have become so popular. Appointed cabinet positions can make quite a difference depending on the domain. There are other ways to side-step the separation of powers.