It's important to note that the negative impact documented in this study is in development time and whether the task is completed. It makes no claims about impacts on maintainability that show up later in the development process. It also does not measure the longer term impact on development time if a team starts using lambdas and gains experience over time.
I say this not to dismiss the study, which appears to be fairly well done and to provide interesting results. I'm simply saying that its results are not inconsistent with lambdas providing a net, long-term benefit if introduced to a development team at work.
I say this not to dismiss the study, which appears to be fairly well done and to provide interesting results. I'm simply saying that its results are not inconsistent with lambdas providing a net, long-term benefit if introduced to a development team at work.