I agree with your counterpoint to OS integration, but Microsoft Teams is infamous for not being "good enough" otherwise. Laggy, buggy, unresponsive, a massive resource hog especially if it runs at startup. It's gotten a bit better, but not enough. These are not complaints on HN, they're in my workplace.

Not everyone is running the latest and greatest hardware, very few actually have the money for that. If you're running hardware from before this decade, or especially the early 2010s, the difference between an Electron app and a native app is unbelievably stark. Electron will often bring the device to its knees.