In fairness, the "Can't write desktop applications" issue doesn't seem to be restricted to Google. The Microsoft Teams app for iOS is fine, nothing special but it works. The Microsoft Teams app for Microsoft Windows is just complete and utter garbage. It's laggy, it's missing features that the mobile clients have, and it's just kind of a mess all around.

In case anyone was wondering why Apple is going with the "iOS/iPadOS apps on the desktop" route, it's because this is so incredibly common; great, first-class mobile apps and nearly unusable, garbage Electron-based desktop apps.

Edit: Plus, in regards to Google, something about Chromebooks. A good desktop app on a Chromebook is just a web app that works well in Chrome. Why make a desktop app for what they seem to think is just an outdated computing metaphor using APIs they don't control?