I think you like the other person is assuming that 5 minutes = low quality. Instead of thinking "5 mins means you can make 8-10 iterations in an hour" or "5 minutes making the front end look pretty good means I can spend more time on the backend"
There are many good faith ways to interpret this.
No one is assuming the output is strictly low quality from what I can tell. I am personally evaluating the method you provided, which suggested you are championing a sloppy but highly iterative design flow against a seasoned curated suite for defining design. I dont see any reason to assume the other comment was doing anything otherwise.
You made a broad generalized strong claim and were met with the opposing force, which is actually acting from their own understanding of good faith, believe it or not (see how this analysis is void of meaning?).