You need to be clear on what you say. There is an "Arcade mode" in this new SWBF2 that is offline, but it is not what you (and many people) are wanting. What you want is the full multiplayer experience, but simply against bots instead of online. Arcade mode is not that, at all.
I and many of us fully understand what you are saying and want. People have been asking for this since the first new SWBF was announced, and they say "if there is a demand for it we will look into it". CLEARLY there is a demand for it. All one has to do is check internet searches for articles, threads, and even youtube video's asking for the ENTIRE multiplayer modes to be able to be played offline against bots. So, I am inclined not to believe DICE when they say that.
Just check my thread here: https://answers.ea.com/t5/Game-Information/Arcade-Mode-is-not-what-was-wanted/td-p/6350964/jump-to/first-unread-message