There are some debates in baseball that just never go away. To be fair, baseball itself causes some of this by stirring the pot from time to time, and that's not a bad thing. Anything that generates discussion is good. It shows that people care. People who care watch games and buy tickets. Thus, here we are again, debating the relative merits of the designated hitter. Hey, don't blame me. The commissioner is the one who brought it up.
Recently, Ben Lindbergh of The Ringer wrote a piece called "Let's Stop Pretending That Pitchers Can Hit," and it's a great read.