Domination victories are the only real way to win. The other victory types are at worst, nonsensical, and at best, cheap. For example, the diplomatic victory is the single most nonsensical victory option there is. So you paid off a bunch of city states to vote for you in the UN, so what? Who gives a shit? I doubt if the UN voted Sweden "emperor of earth" that any major world superpower would care, especially if those given powers were already at war with you.
Cultural victories too. You made a bunch of cultural changes, even if they were the most deep, intuitive, philosophical changes the world has ever seen, most countries would give zero fucks and they're certainly not going to stop murdering you for being just so cultured.
Space race makes sort of sense if the mission was, I don't know, space. If you were the first country to space, it would make sense. You're in space now and can launch orbital nukes. That's some scary shit. But no, all other countries have already been to space, and the space race is supposedly a mission to Alpha Centauri. So? Are we supposed to care you managed to send maybe a hundred people to another star? (no telling how big that rocket is, Civ's scaling has always been shit. The tanks are bigger than skyscrapers). No country is going to stop murdering you because you built big fancy rockets.
Domination only. If you get locked into a forever war, you all lose.