Yes, I agree fully that Stalin's Economic Policies were detrimental to the USSR.

While policies such as collectivisation did bring some short-term benefits such as creating jobs for 17 million people and allowed them and their families to be provided for, in the long run, it led to the 1932 famine, leaving 5 million dead. It also led to lesser food being produced than before, and the people working on the farms started to live in fear and having their movement controlled.

Other policies included industrialisation, and even though it did reduce the unemployment rate and allowed the USSR to survive WWII; workers were overworked to meet high standards, even making mistakes could get them accused of sabotaging the nation. It led to the wages falling over time, and the number of workers slowly started decreasing.

Based on time, while these policies may be good in theory and have many benefits at the start, unforeseen circumstances eventually led to these policies failing and causing more problems than before. Hence being detrimental to the progress and future of the USSR.