Tl;dr
Tabs, and especially every browser maker's recent obsession with grouping them, is just silly. Over the decades, we've learnt that the ultimate navigation is Search and not wasting time clicking through "folders". Expecting users to spend time manually organising tasks is counter-intuitive.
With the explosion of Web, browsers have become extremely sophisticated in managing many (if not most) of our daily tasks. I often find myself with far more tabs open than apps running in my task bar. And more often than not, my task bar is rather empty while Alt+Tab doesn't cycle through anything specifically useful. Nowadays, it feels like Windows is just something I need for booting up; it's become entirely divorced from managing the things I'm really working on - my browser is greedily taking over those duties.
The idea behind Windows was intuitive; to help me manage my tasks. I'd expect Microsoft's Edge browser to build on that idea and provide an integrated, unmatched navigation system - this pairing, after all, is what gives Microsoft a true edge.
Instead of following what others are doing, do away with tabs altogether. They're just an inferior solution to a problem I don't have when working with separate windows.
