You can find a bit better than average qb play in free agency and through trades...Baker Mayfield for example...using a top five pick on a mid first or lower rated qb is bad use of draft value...especially when those players are going to likely bad teams and situations and their flaws will be magnified, which gunner points out in several of his ratings as a concern.
If you want to argue trading out of the very top of a weak qb draft to get more picks to help you get up the next chance you have where there are a number of elite qb prospects, assuming you can find people to give you value for the pick without there being an elite qb prospect, sure...reaching for any position, especially qb to get a slightly better than average prospect...and then saying there's no argument... I'm not with you on that one, but you're welcome to your opinion obviously.
The worst thing to have is a mid-tier rookie qb that you don't know if you should re-sign or let walk...look at Tannehil with the Dolphins, shoot, look at Tua now who has had trouble in the cold and wind late in the season. Look at Dak Prescott and his contract...some of those guys are well above slightly above average...I just don't think you ever reach for a player and seeing elite ceiling due to athleticism and coachability isn't reaching, that's factored into the ratings...some people might have a higher risk tolerance than others...EJ Manuel was a bad pick...JP Losman was a very good pick who went to a very bad situation sadly...we've seen examples of two of those situations play out in Buffalo...don't reach for a qb or any player based on need