Key Points

The quote argues that LLMs inherently “lack the virtue of laziness,” since producing additional work costs them little, which can lead to systems accumulating layers of low-value complexity.
It warns that without constraints, LLM-driven systems may grow larger rather than better, optimizing toward shallow or vanity metrics instead of outcomes that matter.
The passage links the risk to human time scarcity: because humans are limited by finite effort, we develop clearer abstractions and avoid clunky designs that would waste future work.
Overall, it frames LLMs as exposing the importance of disciplined engineering practices around abstraction, optimization, and long-term system maintainability.

Simon Willison’s Weblog

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13th April 2026

The problem is that LLMs inherently lack the virtue of laziness. Work costs nothing to an LLM. LLMs do not feel a need to optimize for their own (or anyone's) future time, and will happily dump more and more onto a layercake of garbage. Left unchecked, LLMs will make systems larger, not better — appealing to perverse vanity metrics, perhaps, but at the cost of everything that matters.

As such, LLMs highlight how essential our human laziness is: our finite time forces us to develop crisp abstractions in part because we don't want to waste our (human!) time on the consequences of clunky ones.

— Bryan Cantrill, The peril of laziness lost

Posted 13th April 2026 at 2:44 am