While having icons for every tab when there are lots of them is nice it unfortunately limits the information about a tab. For example what if I have 20 Wikipedia tabs open? I will just see 20 small "W" icons. In the old edge once you reached a number of tabs you would have to scroll sideways to reach far away tabs but there was a bit of text on each one so you knew what it was about. I suggest something similar, like the icon and then the first 5 letters or so.
That is an interesting suggestion for a feature request. As it is, you can mouse over the Icon for the tab to get the title of the page, which should include the title of the article from the Wikipedia example. I can relay this to the product team for consideration.