My personal opinion is that tags are there to solve a problem, whilst creating wonderful shortcuts to things we'd never dreamed possible...
...only it doesn't always work, and in reality rarely works as flawlessly as promised.
Seriously, if you don't believe me, do a search at these forums for 'tags', and similar. Thread after thread of problems, caused by a system supposed to make things simple. See this thread. And many others like it.
But people still feel that alternatives are a bit 'dinosaur', even when the folder alternatives work flawlessly. I mean absolutely, 100% flawlessly.
I've never put a Beatles album in a Beatles folder, and not been able to find it. Or to annoyingly/magically find it had accidently split everything into into 12 folders I never created. Seriously, it's never happened. Ever.
And the big driver originally was to prevent needless duplications, and the costly storage implications - something which these days isn't really an issue, due to storage being so cheap.
This thread is entirely, 100% to do with issues caused by relying on tags, and it's not the only one. And it's a two-fold issue, the first being the issue of whether or not the tags 'work', and the second being how your particular system (in this case WiiM's tag reading) works.
Move to folder view and duplicates, and absolutely all of those issues disappear. The main reason for not doing this originally (in the early days of ripping) was the cost of additional storage when using duplicates, and that extra storage is now astonishingly cheap. Other issues, like the additional flexibility tags can add, are still all there when using folder view, as long as you've tagged everything.
To reiterate, I strongly recommend you structure your music library by a folder system of your own choice. How you view it after that is entirely up to you, but having your music in a structure you've chosen is a great base onto which you can start, and rely.