> The key message here, of course, is to choose a specific shell. If you’d rather use ZSH, or Python or Node for that matter, set it to that. Pick a specific language so you can stop targeting a lowest common denominator
Seems like dash would be fine for the author.
I agree, any claim that you should do XYZ should give a strong argument.
The article here does try to give very short arguments, to be fair. I leave unconvinced by many of them. For example, requiring bash means you can't use dash; dash is less capable but much faster.
I prefer arguments that walk through the key pros and cons. Longer, but in long run more useful.