Had to get used to it initially, but now I really love Arc. On other browsers I always used to bookmark things and never look at them again, because it's such a hassle to remember where you put something. The 3-tier system of pinned items (frequently used apps like youtube, discord, slack etc), pinned items per space, and then normal tabs works great.

I do think Arc will remain a niche browser though, because to get the most out of it you really need to use the command palette and I don't think the average user will bother with that.