The top four teams are in the final NFL four. Dallas was close, but they weren't good enough. They're probably tied with Buffalo for the top 5 teams. If they had managed to pull out a win they weren't likely going to win the NFC title or the Superbowl full healthy. With Pollard out they had zero chance to advance. Just not enough weapons left.
As far as Dak, everybody seems to think their team is entitled to an elite quarterback. Well, San Fran ain't got one, either. There's only one Mahomes and one Burrow. There's no path to getting one like that other than getting incredibly lucky with a fluke draft pick that pans out like nobody ever expected. Deal with it. They got Dak with a 4th round pick, and they're getting tremendous value. They just don't have enough around him, or a staff that can figure out how to lessen his weaknesses and play to his strengths.
I've never been a Pollyanna sunshine pumper fan, but I'm well over having typical shithead fan deluded expectations. The Cowboys had a better season than most anyone expected. They got about as far as they could with the team and staff they have.