A very good article and the author answers their own question. Because they’re the “big tent party,” democrats support a spectrum of views and compromises, albeit largely unified on some issues (the author notes a few widely accepted positions across the party, like abortion)

Whereas Trump voters are in lockstep in their hatred and fear mongering (let’s not pretend trump had or has any policy positions). You’ll find those same views at the Iowa primaries or at that diner in Ohio. It’s simply easier to summarize this relatively simplistic and basically apolitical view, so journalists took the easy out. Short, punchy articles with increasingly excessive “hot takes” got them clicks and now here we are