Full disclaimer, not exactly a bug, but it's a serious user accessibility issue:
The Workshop is extremely difficult to navigate for console players, and to a lesser extent, PC players.
Console players don't have an easy way to bring up a keyboard to type what they want into interfaces and search functions as PC players do, and PC players are not always willing to boot up the game just to subscribe to a mod they thought interested them.
It is also inconsistent between the web and in-game version, with changelogs being a feature on the web and not in-game.
This needs to change otherwise the game could definitively push people away despite one of Arma's selling points being moddability, especially on Xbox as it's so far and few.
There's a solution to this that could be taken and learnt from the Steam Workshop:
You can subscribe to and interact with mods without using Steam or opening the game that you are trying to get the mods for, this allows for an accessible and easy way for players to not have to commit to opening the game and using its systems to interact with browsing mods, when they may want to be doing this as a secondary task or idly browse while away from their gaming device.
Seemingly, this seems like the workshop was made with this in mind and the game itself, seeing as you have a BI account connection required that seemingly doesn't actually do anything right now beyond allow Xbox players their "workaround"(which can easily lead to data breaches and information leaks of users).
Provide this account an additional function:
Allow players to interact with the workshop and subscribe to mods through the website version.
No need for anything else, though if it were possible to spare some more resources, creating an *exclusive* method to download mods *without* requiring the game open would do wonders(so performance won't be hampered on the device downloading the mods), probably way easier to do this on PC with a different launch option instead of launching the game proper than it is on Xbox, but just an idea.