Any team needing a QB would assume that their offensive scheme would be better than the Cowboys offensive scheme.
A team that expects to be top 5 or top 10 in the draft is unlikely to trade for any veteran QB, but a team that expects to be outside the top 10 in the draft would give a 1st for Dak.
There is only 1 really legit issue with Dak. He needs more space and time to physically throw the ball than a QB like Romo. Defenders in his face affect his throwing more than some other QBs.
He does NOT panic due to pressure as in "oh no I'm going to get hit". He does intentionally try to get rid of the ball earlier when there is consistent pressure in the game and this offense does not function well when the QB can't wait for receivers to get open.
His stats go down in games with greater then 40% pressure, but his stats on actual throws under pressure are not a problem. That fits with the above explanation.
His completion percentage and average per completion are only slightly below Tom Brady. Dak's only accuracy issues are when he has a defender in his face.
In 2017 the Cowboys receiving options were a disaster. Dez fell off the cliff to the point that TWill saw the #1 CB as often as Dez did. Without double coverage on Dez, defenses doubled Beasley, especially on 3rd downs. Witten's speed dropped dramatically from 2016 to 2017 and he was not fast in 2016.
The receiving options to start 2018 were not very good either. Swaim as the #1 TE. Hurns as the #1 WR. The 2nd outside WR was often Deonte Thompson with the rookie Gallup in the mix.
Then they got a legit #1 WR in Cooper and we've seen the results as a 3 game win streak.
Get a legit #1 TE next year and it will have a similar affect to adding Cooper.
I would buy the scheme argument a lot more if there were not wide open WR and TE running all over the field the first half of this season and he was either taking a sack or dumping it off. And as far as 2017 goes, Dez, Wit, Beas and company were just fine until Zeke went out, then you are saying they just all disappeared? Don't buy it. And he DOES panic in the pocket, call it what you want but when he runs in circles and gets sacked or he makes a piss poor throw because he panics when there is no pressure, I don't know what you call it, but its bad QB play in my book.
Now over the last few games, he is playing better, much better and I hope the light has come on for him. Looks like he will be around for awhile, so for all our sake I hope he turns into a HOF QB with 15 SB wins.
But I will say this.. I would not trade a first for him if he was on another team. I think any team that does/would is rather stupid. You get a qB with his skill set all over the draft board, no need to spend a first for a game manager QB.