Brawn's arguement was that Formula 1 made a mistake moving to the current set of regulations, as although giving the drivers more downforce seemed like a good idea at first it came back to bite them.
"The huge increase in downforce was 'let's make the cars go faster, let's make F1 better;' But what we have actually done is made it worse because the cars can't race each other," said Brawn.
"It's an example of an unthought-through programme. So, the cars are very quick now, but they're not raceable."
When asked about this subject, Vettel disagreed with the Englishman: "I think the cars are a lot more spectacular since 2017. Now we know what the cars can do, it was quite slow before that.
"Obviously we had very little drag, and it was great in a straight line, but that's not the exciting bit for us.
"And it felt a bit slower than some years earlier. So I don't think that was the wrong direction."
Vettel went on to say that increasing the weight of the cars was the wrong direction to go in.
"The wrong direction from my point of view was that the cars are so heavy, which is obviously related to in a way some of the safety measures, but I think everybody accepts that, and the power unit.
"I think that really is the biggest difference if you really make a big compare between now and where F1 has been 10 or 20 years ago, or even further."
Bahrain International Circuit - Winter testing