We've drafted two defensive tackles in the first two rounds since the 2005 draft, when Parcells not only drafted Marcus Spears in the first, but Chris Canty in the fourth and Jay Ratliff in the seventh, after getting DeMarcus Ware in the first. The picks we used were 58 in 2019 (Trysten Hill) and 26 in 2023 (Mazi Smith).
In contrast, the Philadelphia Eagles have drafted two DTs in the top 13 in the past five years (Carter and Davis). Before that, they took Fletcher Cox at 12 in 2012.
The Washington Commanders took Jonathan Allen at 17 in 2017 and DaRon Payne at 13 in 2018. Since then, they've missed on Phidarian Mathis at 47 in 2022 and seemed to have done OK with Jer'Zhan Newton at 36 in 2024.
The New York Giants did well with Dalvin Tomlinson in 2017 (the lowest draft pick among the absolute success stories at 55) and then found a star in Dexter Lawrence at 17 in 2019.
So I would say that the main problem is investment. To hit on top DTs, you've usually got to do it inside the top 20 picks of the first round or get lucky in the second.
As far as DEs go, yes, Taco was a miss but Parsons was a find and DeMarcus Lawrence was a solid pickup. I'm not going to go through the other teams' drafts like I did for the DTs, but I'd bet our success rate is similar to theirs depending mostly on the draft position.