Ну например, почему Please был написан на go:
> We excluded most other languages that any of us were familiar with through a process of elimination; JVM languages were ruled out from a concern about startup overhead, we were concerned about Python's threading performance for an inherently parallel system and felt C++ was too fiddly and lacked a strong standard library. Rust was still pre-1.0 at the time (although that didn't take long, as it turned out) so we felt it was a bit early to leap into that.
It also turned out to be a really useful way of learning the language; the project is about the right size to explore it properly and sufficiently self-contained not to affect other parts of our repo until we were sure Go was a language we wanted to do more of.
We're very happy with the results; the performance of native binaries is excellent, the language was easy to become productive with and has great support for all the things we needed to do with it. Our early concerns (e.g. the classic "no generics!") turned out to be a lot less problematic than we expected.
An alternative explanation is that the original high-level design meeting for Please was an impromptu discussion in a pub one Friday evening, where we thought it would be a neat language to try despite none of us having any real experience with it.