In Microsoft’s defense Teams is an electron (or electronesque) app and offers quite a bit more than Zoom in terms of features. The fact that it uses so much RAM is expected when you consider it as another copy of chrome.
It boggles me to no end that Microsoft is switching to electron apps even for Windows. You would think that they could write native applications that wouldn't sacrifice stability, performance or functionality the way Teams does for their own operating system.
"Expected" != "Acceptable" though, IMHO.
I don't see how that's a defense. MS choose to use Electron.