@Z0DIAK-BRAVE posted so far*
@John-Paul-RAGE I get what you mean. The issue seems to be that your original post was too well written.
Basically you pose it might have been a better idea for the first collab to be with an anime more popular in NA than konosuba(which I've never heard of myself). Sounds straight forward to me.
However, I think that releasing something that might be less received(by non-hardcore fans) sooner allows 1) for the hardcore fans to experience all the content, which is good, but also not much of a reward since it's rightfully expected and 2) by the time the game really starts picking up steam, gaining a larger playerbase(and additional platforms) they can drop the more wide-reaching collaborations and keep the hype going.
I think of it as an opening band kind of scenario, warm up the crowd first.