For world building, I switched to using a companion app.
I’ve had Scrivener projects that have turned to treacle when they have contained more than a few hundred files—especially when doing things like running global search-and-replace runs.
And things get more tricky if you need to sync the project to multiple devices, let alone whether or not those devices are running different operating systems.
You mention being on the fence because of buying, so if cost is a consideration, you could try other apps before you settle for Scrivener. I use a writing app with wiki capabilities that can handle thousands of files in one project and sync between multiple devices in seconds using any sync service the user wants to use.
Another bonus is that the interface on all the devices is 99.9% identical, whereas with Scrivener there is a world of difference in terms of look and (interface and app) functionality when switching between macOS, Windows, and iOS. There is no Android version of Scrivener.
You can use multiple tabs or have tons of files open in their own or windows, which is really useful when world building. You can also run complex searches to bring data together or embed notes, images, etc using wiki-style syntax. Way more powerful and user-friendly, in my experience, than Scrivener for complex projects (especially ones with thousands of files).
You can edit the files with different apps (if you want to) and you can leave projects open on your devices and still sync content cleanly. I wrote this sentence on a Mac. This one on an iPhone. And this one on the Mac again. The file was open on both devices at the same time and the text appeared on both devices within a couple of seconds of typing. For fun, this line was written in a different app (VS Code) while the file was still open on the Mac and iPhone. And this sentence was added in TextEdit. Scrivener could not handle something like this.
For personal use, all of the above is free.
And you can still import work into Scrivener if you need to or just run the two apps side by side.
Try different apps and see which one works best for you. Horses; courses.