Accessibility -- native keyboard shortcuts often work better in native apps, and a lot of Electron apps aren't navigable at all without a mouse or with a screen reader.

Lower memory usage than a chromium instance.

Visual consistency.

And, subjectively, the knowledge that the app developer has put more than the minimum effort into the product. I'm not saying that great Electron apps don't exist -- in fact, my current favorite Jellyfin player is one -- but on average, even the best Electron app is worse than a middle-of-the-road native app.