Thanks for the in-depth reply, a lot here that I agree with, particularly on the homogenisation/monoculture issue (which I wish I could offer a compelling answe

Thanks for the in-depth reply, a lot here that I agree with, particularly on the homogenisation/monoculture issue (which I wish I could offer a compelling answer to -- telling people not to share their code would clearly be throwing the baby out with the bathwater). Unit test vs REPLs is an interesting one. Agree that there are similarities there (although I'd argue that your tooling needs to be pretty damn good for unit tests to offer the responsiveness that a good REPL can). For me, I think part of the difference is that a REPL session is personal and nobody sees the blind alleys, while unit tests are an enduring part of the product and something others will see, use, and potentially critique. So while they can address the same kinds of questions, I'm not too shocked that people feel differently about them.