The post discusses the challenges and considerations involved in writing a custom C++ standard library. Key points raised include the lack of certain common functionalities, such as string trimming, in the standard library, leading many developers to implement their own solutions. A significant point of discussion is about ABI stability and the complexities of linking different versions of libraries. Comments highlight that modern C++ features increasingly depend on the standard library, complicating the development of alternative libraries. Additionally, there is interest in C++ modules support and the differences in implementation size and compilation time when compared to the standard library. There's a mix of fascination for the experiment and critiques regarding the limitations and overhead of the existing standard library.