I'm a Giants fan, yes, but you can't reasonably call me a troll. My wife and stepson are HUGE Dallas fans, and I (often to my chagrin) necessarily am very up on all things Cowboys.
You may not agree with my analysis, but I am offering it ONLY from the perspective of what is best for Dallas in my opinion from a football and cap perspective. I think it is an interesting game, this front office stuff.
If I REALLY were looking only through Giants-colored glasses, I'd be all for Dallas spending like a drunken sailor in FA, restructuring everyone to create every last immediate penny, and watch it all come crashing down when Dak and Zeke come off their rookie deals.
But I truly think that would be idiotic from the Dallas point of view. There are no guarantees. Luck and injuries play a large role in who ultimately wins year to year -- see the 18-0 Patriots or 15-1 Packers as two recent examples. So if I'm Dallas I'd rather have a real chance for a longer period with Dak/Zeke, than put all my chips on just 3-4 seasons of the 8-10 years they are likely to be around and flourishing, barring the unexpected.
As for the Giants, on the other hand, I think they can rationally defend doing whatever it takes cap wise to rebuild the offensive line even if it means wrecking the cap in a few years. Unlike Dallas, the Giants have no heir apparent at QB, and are almost certainly going to have some dark years after Eli goes. I think Eli's window as an adequate QB (at least -- see Peyton of last year) is 2-3 more years, especially with that defense. So they should go all in, and suck it up. The sun sets on this era in the next few years no matter what, and their window is nothing like Dallas'.