Compatible with the explicit disclaimer that they may not match the finish of or be optimal for use with that specific collection.
Saying "not optimal for use" is the exact opposite of an explicit disclaimer.
I have to agree with Chimera. An explicit disclaimer will be something like: "use of steel bands with Sports watch is not recommended due to possibility of galvanic corrosion." This "not optimal for use" language could mean anything -- it's totally vague and unspecific.
----------
I have to say, I think that it is you who is trying too hard. To me, Apples wording makes it clear that there is some sort of issue, outside of aesthetics.
Yes, but what sort of issue? It doesn't say.