I think many people in the comments suffer from some version of curse of knowledge.
Sure, this feature us quite irrelevant for a power user who is quick to navigate the browser and needs a split second to remember what tab it is simply by reading the header and seeing the icon.
However, many less proficient people can benefit from this feature. Not once I saw how someone who has 10 tabs open and needs to go to a different webpage, starts meticulously clicking through every single one of them because they have no idea how the page they are looking for is called, they are too overwhelmed by using web as a whole to take notice.
I’ve used to do semi-competitive swimming as a child. Honestly one of the worst (as in boring, great for health and fixed my scoliosis) types of sport to do for an agitated child who wants to explore the world.
For an hour and a half you do laps while staring at the tiles on the bottom of your olympic pool. Would spend the entire time memorizing every crack on the tiles as well as doing entire video game playthroughs in my head lol