I don't question that their web-apps are good. I also didn't imply the native applications were any good.
But there is absolutely no reason for a mail client or calendar to use gigabytes of RAM and have significant impact on battery life. Which is bound to happen if you bundle Chromium et al. and run the webapps in it.
Yes, I know. My point was that it’s not like Electron where they ship Chromium with every app, it’s more like a browser tab in terms of resource consumption.