You likely know what I'm talking about, tab pinning is broken in all mainstream browsers, it isn't broken in Arc. In addition, you can pin groups of multiple tabs tilled side by side (not very useful without a wide screen, but still)

I'm not the person you asked but I love it. It's actually solved my tab hoarding problem and made my life so much simpler. Caveat: I'm an ADHD sufferer so my experience may not be typical.

I actually have ADHD(I) as well, and have been trying to battle tab/bookmark hoarding myself. It seems Vivaldi is working well, but I was wondering what Arc has to offer.