What is a notable drawback of blockchain technology?

High energy consumption for computation is indeed a significant drawback of blockchain technology, particularly in systems that utilize proof-of-work consensus mechanisms, such as Bitcoin. These mechanisms require extensive computational power to validate transactions and secure the network, which leads to considerable energy usage.

This energy intensity arises because miners must solve complex mathematical problems to validate transactions and create new blocks. Consequently, the environmental impact associated with this high energy consumption has sparked considerable debate, adding to the overall concerns about the sustainability of blockchain solutions.

While the other options hint at various challenges associated with blockchain, they do not capture the widespread consensus on energy consumption as a notable drawback, especially when comparing blockchain to traditional systems. The high energy requirement underscores an ongoing challenge that developers and researchers in the blockchain community are actively seeking to address through alternative consensus strategies and technological advancements.