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Simply put, people don't love Edge as much as they love Chrome. The browser bundled with Windows 11 is naturally Edge, but users who use Chrome install Chrome of their own volition, so forcing them to open links in Edge is extremely annoying.
I don't use either chrome or edge but why would I use a clone instead of the real thing? I never understood why Microsoft thought cloning chrome was a good thing for adoption. Edge is just chrome now but with some annoying bloat like the coupon pop-ups and pay later scams.
It’s all about Electron. There may be a Microsoft contingent that thinks it’s the future or maybe they are just hedging, but for now it’s important for stuff like Teams.