I’ve used OmniOutliner since v1. I find myself using OO to open old outlines, but I work on new outlines in Dynalist, which I find much easier to work with.
I wish OO had the navigation and filtering features of Dynalist:
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Clickable tags that reveal all items with the same tag;
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Saved searches;
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A Hoist widget to the left of any topic;
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A breadcrumb path at the top of the window for instant navigation upstream;
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Search filter that will reveal only items containing search item;
None of these features require advanced engineering. They require embracing a slightly different design that works better.