I'd love to see a feature like that. Having to use even more windows to group tabs together is IMO pretty inconvenient when you want to quickly switch between tabs in different groups. For example in my main Edge window I had a group for all Jira tabs, a group for all documentation tabs, group for all development tabs, a group for all Azure DevOps tabs, and a bunch more and kept switching between them.
Tree style tabs kind of give me a similar feature, I can just put all Jira tabs in one tree branch, but it's less... "visible"(?) so to speak compared to the bright colours of Edge tab groups.