Personally, I think albums like this should be separated into 2 entries. I feel the same about that recent
Touhou soundtrack. In both those entries, it's
clearly two albums being lumped into one entry. They have separate cases and covers, etc.
The current guidelines for enclosure albums work well, but I think we should also look at them on a case-by-case basis. In some cases, separating the albums is more logical than grouping them together.
I would like to hear your thoughts on this.