The problem is, such an utopic system where everyone works on whatever they want and gets free housing from the state was economically unsustainable long term. Which is why it collapsed and most of those people working in science immediately packed their bags and move to the US when it happened because talented people working on interesting things don't like living with shortages in a strict oppressive environment where you had to constantly watch your mouth or risk having your career or life ended swiftly.

It was only sustainable back then due to the massive natural resources the SU had, while enduring shortages and exploiting the forced/slave labor the SU had access to. Not something replicatable or desired in free societies today, though plenty of modern slave labor practices exists in rich western nations today where some industries only survive due to access to cheap labour willing to work below market rate and live in worse conditions than the locals.