The problem with the previous attempts was prioritizing ideology over real life problems

It was actually not the case, the USSR was the most materialist and least idealist country. The 1929 collectivization drive was kicked together with the first 5-year economic plan of the Soviet Union, which drove a growth of 10%+ in economic output YEARLY during the following decade. This was a necessary preparation measure against the constant threat of external invasion for the sin of being communist, as demonstrated during the Russian Civil War when the Reds were invaded by England, France, the USA, Italy, France and Germany, all of whom helped the Whites in hopes of restoring absolutist monarchy and the Russian Empire. Stalin famously gave a speech in 1931 saying that the USSR was 50-100 years behind in industrialization and they had 10 years to make up for it or they would be crushed. 10 years later, Nazis invaded the Soviet Union.

If it hadn't been for the industrial boom made possible by the rapid collectivization of agriculture, the Soviets would have lost to the Nazis, leading to the extermination of tens of millions of Eastern Europeans according to the Generalplan Ost, ideologically very similar to the contemporary genocide of Palestinians by Isn'treal as an attempt of settler colonialism. Additionally, the industrialization led to the total elimination of famine in a formerly backwater feudal Russian Empire, raising the life expectancy from about 30 years in the 1920s to 60+ years by 1955.

There were mistakes and failures in the collectivization policy which led to a degree of unnecessary suffering, but these weren't due to idealism, Marxist-Leninists are fundamentally materialist in their analysis which is the polar opposite of idealism, they were the consequence of lack of knowledge and of hurries to do the first successful complete collectivization of land of a nation in human history.