Yes, but every player understands that it is team-biased because there is a salary cap. Their contract has to be worked within the structure or it greatly diminishes the ability of the team to build a roster. That doesn't mean the player and his agents don't try to get as big a slice of the pie as possible, but they know they have to do it in a way that makes sense for the team.
Right now, both sides are in the heavy negotiation stage, with Dak's team asking for more than is cap reasonable and Dallas offering a deal that is less in some way(s) than what they will eventually settle on. Both sides hope the other will bite before negotiating up, but leaves itself room for concessions. This is why I'm not concerned about the negotiations at this point. When we get closer to the deadline to strike a deal, both sides will alter their demands and likely come to an agreement. Fans and the media are the only ones handwringing over a deal not being reached yet. This is just typical negotiations, especially for the Joneses. We can look to last year to see that, when the Joneses didn't reach a deal with Lawrence until they had to in order for him to get surgery in time to be ready for the season.
Now, some might bring up the Elliott ordeal since he held out, but Elliott was a different issue because he was under contract and wanted to have his deal redone with two years remaining on it. Generally, you don't want to do that as a team because it sets a bad precedent. However, Dallas was in good position to go ahead and get that deal out of the way, especially because it's a running back since their prime is usually shorter than other positions. Now, when the team gets to 2023, if Elliott's play has slipped, Dallas can move on and save cap dollars instead of a taking a hit for it if they had waited to re-sign him this year or next year. (Yes, they absorb $6.7 million in dead cap money, but save $8.3 million because his cap hit is $15 million.) That's one reason I don't see Dallas restructuring Elliott's deal. The Cowboys can if they have to, but they would be pushing money further back in a contract for a position with a short overall career.