When you view an album in the mobile app, you see the release date at the bottom. Not just the year, but the month and day as well.
In the desktop app, even after the March 2021 update, you can only see the year.
For parity between the two apps, the desktop app should show the full date including month and day. Since desktop and web now use pretty much the same layout, this could be implemented for web as well.
The full date is very useful information to me and currently I have to check my phone or use the API to get it.
My main use case is making monthly playlists of new releases, but this is valuable for historical things as well -- a lot can change in a year.
It's not important to me how the date is displayed, just that I can see it somewhere on all platforms.