Duolingo CEO Luis von Ahn said there's some work AI cannot replace. Bloomberg/Getty Images Duolingo's CEO said AI can't achieve the "level of creativity or the polish" that his top designers can. Luis von Ahn said he won't lower the quality of his team's work by pushing them to use AI unnecessarily. Duolingo has backtracked on evaluating its employees' performance based on their AI usage. Duolingo's CEO said AI still can't match the work of his company's artists and designers. On Tuesday's episode of the "Rapid Response" podcast, CEO Luis von Ahn said that his team is trying to use AI as much as possible, but "we really don't want to decrease quality." "For some things, AI is quite ready to do high-quality work. For some things, it's just not," he said. "We're not going to decrease quality just for the sake of using AI." When podcast host Bob Safian asked where AI still falls short, von Ahn pointed to design.…