It's not really a party when all the focus is on one person. It's true of the GOP with Trump. And it's true of 3rd parties like the Greens.
This is an excellent point. Sure, you can run for president. Who is going to back you up in the house? In the States? In the counties? In the municipalities? In the school boards? In the judiciary? To run a country, you need a bunch of people, not one charismatic person at the top