To be fair, you must temporarily subscribe to any Workshop content in order to download it. This is a Steam limitation.
The issue here is that you never get unsubscribed.
This can happen on regular workshop models as well if you close the game mid-download (or if the download never finishes).
Can you provide any further reasoning as to why soundpacks were designed to not automatically subscribe? I find it to be a great quality of life improvement on all the items that currently support it.
Because soundpacks are meant to be something you subscribe to when using them. If it automatically unsubscribes it’ll unsubscribe anything you use as well. There is no way to mark workshop addons differently when downloading them. You can download directly but it hitches the game significantly so we have to use subscribe.