Thought collection...you got me thinking. Some years ago I finally decided to really own this question, after decades of using others' tools, from Dokuwiki to Keep to Notecase Pro. I thought it'd be hard to maintain my own but that hasn't been the case at all.
So I guess my first suggestion here is to casually start your own, opinionated system if it seems useful. Because today I feel like I can solve just about any problem with mine.
My system is based around some standards, like I use Markdown and folder taxonomy, with a few types of syncing for redundancy. I write my own tools to parse for various tags and things. Like I have one snippet that will compile a daily schedule for me based on tags it finds in my markdown files. For interfacing I use a combination of snippets (calling external tools usually) and system keyboard shortcuts. There are a number of different search shortcuts using different apps like FSearch, there are shortcuts for opening yesterday's/today's/tomorrow's journal page, a snippet for recommending books and movies, etc.
1K (items in the list; the file itself is 53KB) is hard to explain. At first it was very troubling to be excited about the list growing... Is this just a numbers game, or what? But pretty soon I found that for daily use, specifics are very important. So for example "The Cold War" is in there but it's worthless because I shouldn't have to think so vaguely when it's suggested to me as something to dive into. It's not helpful.
Better would be "Ranking favorite Cold War movies in my TV and Movies Log" or "Reading about BRIXMIS". Which are both in there.
Tabs are an interesting topic to me as well, though admittedly not in the interests file yet ;-)
https://www.friendlyskies.net/maybe/why-closing-tabs-is-so-h...