If I have www.kagi.com open in a tab but then, hours later, with 90+ tabs open, I ⌘ + T to open www.kagi.com again, Orion should I suggest I switch to the already open tab instead of happily obliging and opening the duplicate.
Arc does this very well: 
This is not something any user would "actively" use per se, but rather an enhancement that would benefit pretty much anyone, globally, forever. Who wants duplicate tabs unless you explicitly right-click on a tab to duplicate it?
This would have the nice side effect of "automatically" reducing the number of tabs people have open, minimizing pressure on the need to handle "tab management", incidentally another topic where Orion could greatly profit from improvement.
