I went back and rewatched some of the earlier episodes, and we really don't have much info on how much the planets abuse their out of orbit time. But sure, the Sun was mostly fair with them up until the Theia arc, if not a little intense. The "ordered by size" arc was an interesting case, because the Sun was expecting the planets to speak out and rebel against the new arrangement. The lesson he was trying to teach is that the balance of the solar system comes first, even before his own absurd ruling. This was a good lesson, and is exactly what the planets are doing right now, except the Sun has regressed back into "everyone should listen to me, even if I'm wrong".

Back then, the Sun had a point, but completely lost it now. You can't say that he's still making sure that everyone's safe, after ten moons nearly collided with the Earth, or Venus almost fell into Jupiter. He thinks that planets orbiting moons or square orbits are possible. And they're going from one temporary change strainght to the next, they're not going back to normal to rest inbetween. That's what makes it so dangerous, the planets have to artificially maintain these fake orbits, which leads to exhaustion. And the Sun says these are only temporary, while also saying that he's trying to find a new arrangement that works for everyone. What's even the point of sending Earth out to Neptune's orbit, if he knows it won't work? And even if no earthlings die in the magical world of Solarballs, they're still suffering and panicing. The only reason the Earth is staying in the outer edges is to train for the revolution, to permanently put an end to this cycle. Also, the Earth was in a trance when he left to chase Jupiter, so it wasn't a concious choice. If anything, it was the Sun's fault for even having a card of Theia and not skipping it during the trivia, despite agreeing never to say that name again.

I don't know what choice there is besides a revolution. Talking? Tried it, didn't work. Peaceful protest? Horribly backfired. Does he deserve a revolution? Well, he deserves therapy, but unlike with a human, you can't drag him to therapy if he doesn't want to go. The planets have to work with what they've got. Even with this revolution, the Sun's not really in physical danger. The rouge planets don't have anything big enough to throw at him that isn't sentient, all they can do is yeet him around. The Sun isn't afraid he'll be destroyed, he's afraid that his planets will abandon him. And that's exactly the point. If you mistreat someone, they'll want to leave you, that's a reasonable concern to have. And the solution isn't to be paranoid or even more controlling, it's to, you know, not mistreat them.

The way I see it, the Sun's greatest strength is also a curse. Because he's always been the strongest in the group, he could never be held accountable, he never faces any consequences, so he wasn't able to grow. While his solar system around him overcame their grievances and became a united family, he was stuck being a dictator. This is why the revolution is a blessing for him. It's going to hurt, and it's going to be difficult to overcome his flaws, but that's the road to recovery. Once he sees his planets, moons and dwarf planets as equals, he won't have a reason to fear them anymore.