Thanks. The intended tone of my comment was to be factual and direct, not to be derogatory. Pointing out a mistake is certainly not the equivalent of calling someone stupid.
I also agree that sometimes it's a mistake to use a language that may later turn out not to be powerful enough. Consider ugly build-system languages that were once fully declarative but had to evolve imperative features to cope with difficult cases. They would have been better off using something like Python from the start.
I will also admit to misreading the comment. I initially read it as calling the principle mistaken, but I think the word choice is perfectly fine now that I understand the target.
I also agree that sometimes it's a mistake to use a language that may later turn out not to be powerful enough. Consider ugly build-system languages that were once fully declarative but had to evolve imperative features to cope with difficult cases. They would have been better off using something like Python from the start.