It's entirely valid for them to decide they don't want to change their ways. However, it is frequent that technologies will be rejected because the requisite le

It's entirely valid for them to decide they don't want to change their ways. However, it is frequent that technologies will be rejected because the requisite learning to understand why and how to best use the technology is not done. A common example of this (in my observation and ignoring the application of the technology where it's entirely unnecessary) is NoSql where teams have attempted to use those databases as they used their relational counterparts which obviously didn't work because they didn't shift how they were thinking about using storage and structuring their systems. Anyway, that was how I read the GPs post, as attempting to note that the Deno team may not have pushed through the mental shift required to really get the most out of TypeScript. [edit: not trying to take a stance in support of the GPS post or either side of this discussion, to be clear]