I see literacy isn't a strong point with certain people so I'm going to break it down:
Tyrod over his career has:
70 yards per game on average less than Dak, who is already blasted for low passing volume (WHERE ARE THE 300 YARD GAMES?!?!)
Lower completion % when Dak is already blasted for his accuracy
Lower yards per attempt, net yards per attempt, adjusted yards per attempt, adjusted net yards per attempt when Dak is already blasted for throwing short too much
Higher sack % when Dak is already blasted for holding the ball too long
Like, this isn't even a defense of Dak, particularly. It's just that Tyrod is clear-cut worse than Dak across the board, and in the specific areas Dak haters are always going apoplectic about.
Tyrod Taylor is a bad option ESPECIALLY if you hate Dak's style of play, because he's just an across-the-board worse version of Dak.