FWIW, VS Code doesn't really work on Wayland either. For many people it still links against outdated Electron, which means a lot of Wayland-native features are broken out-of-the-box.
I don't disagree that native apps should be a goal, but what does it matter with a video call app? Even Apple knew they had to throw in the towel here, Facetime can call direct-to-web now. Arguably, Microsoft's reluctance to make a good Skype webapp could be cited as one of the reasons for it's demise. Who knows, maybe we'd all be Skyping people still if Microsoft didn't wait until 2019 for a truly nice PWA. It won't save Teams as a product, but it would be a fine way to salvage it as an application.
If you want an attractive groupware tool, it has to work on everyone's system. If you want an attractive IDE/text editor, it has to be the best for that specific system. These two goals, markets and products are completely distinct. By recognizing this dichotomy, I think they're strengthening their product lineup.