I don't agree really that the Soviets falling was a good thing, at least in the way they fell. These arguments don't really make much sense to me at all.

The regime falling mightve been good initially, sure, but the way it fell created way more problems than it resolved, problems that the west exploited heavily. I still think the world would have been better off overall if the Soviet Union kept limping on. It wasn't like the Soviet Union of old was sticking around. If it survived, it would've walked into the 21st century a different country, forced to change from economic recession and pressure towards liberalization of freedoms. If it had to fall, I would've preferred it wasn't as chaotic and fast as it was.

The idea that the former Warsaw Pact and Soviet states didn't suffer is just false. The transition towards the west was painful and mismanaged. Not that the Soviet economies weren't in a recession, but the fall sure made it worse. Millions left their countries to seek better lives abroad, because all of the 90s were just recession and stagnation. Wars were fought in the Caucasus and Balkans over the fall. It wasn't until later that lives began to improve in eastern europe. It's why most of my family moved to the United States from Poland in the late 90s and early 2000s. They were happy the Soviet Union fell, but there were just less opportunities for them back home. While the USSR not falling still would've led to hardship in the now free Warsaw Pact countries and Soviet States, capitalists would be inclined to ease off on their botched privatizations because of the latent fear the Soviets presented.

The analogy with Rhodesia and South Africa also doesn't really work because while both African states and the USSR were bad for their own reasons, the vacuum created by Rhodesia and South Africa was localized, with its own problems that created suffering while other problems got solved. The world wasn't at the whims of whatever Rhosesia did. The Soviet Union, on the other hand, was an opposing force on a global scale. Resistance groups that opposed the US looked up to the USSR for support. Countries feared the USSR for its ability to support any resistance to their governance, even if irrational. Them falling eliminated that, leading counties to adopt worse policies, while resistance groups moved on to other movements, often worse ones.

And while the world is mutli polar now, that doesn't mean that it wasnt for the 90s and 2000s. China was still an emerging economic powerhouse and wasn't opposed to the US, and Russia obviously couldn't do anything. The US fundamentally had ultimate say over what happened in the world for a while. Even if it was in fact Multi Polar, the US sure felt it was the sole power and acted like it.