It's not marked as such, but the last paragraph, plus the fact that the Featured Artist style page says it applies to guest spots only, makes it clear that it's not just a technical concern.
But that's true with any band, is it not? There's a reason we don't subdivide Crosby, Stills, Nash and Young into four separate artists, or split Tom Petty and the Heartbreakers, and it's a conscious choice, not a technical one. The band is a singular unit, regardless of how the name is formatted or one member being elevated in status above the others, it's still one band.
Just because we can split artists names doesn't mean it makes any sense for us to make them as granular as possible. The collaborations don't appear in artist searches, and it's impossible to generate a list of albums that don't include solo work. Plus there's really no substantive difference between a band called Eurythmics and one called Lennox and Stewart. I think we've already been too aggressive in splitting artists in some cases, and should probably have a rule that says something like two or more releases with the same name means it's not a short-term collaboration.