Mega +1 for this! (racking my brain to think of a synonym for huge, massive, large, big so I went across the pond and borrowed from our British friends…)
This is one of the few things in Obsidian that gets me multiple times/day. As the day goes on, I’m often surprised to find I’ve 3-4 tabs of the same reference note open. Multiply that by several reference notes and it explains why my tabs quickly become so small I can’t even make out the first letter of the tab title. For long reference notes, it’s also inconvenient to have to find your scroll location again because new tabs always open the doc scrolled to the top (as you’d expect).
I don’t see a conflict with the “open in new tab” (Ctrl/Command) modifier for Open Quickly. The only time I want a duplicated tab is to open the current tab in side-by-side split but there are already commands for this: Split Right, Split Down. It doesn’t make sense to me to have multiple tabs of the same doc open unless in split view. So my vote is for the Quick Opener to always open an existing tab if it exists, have a setting to determine this behavior, or have another modifier key available so the user decides each time.
Thanks!!