"musicality" is a term not only in the audiophile lingua...
It is a term for maestro, musician teachings and acousticians ...
It is a subjective quality which react to objective parameters change , be it the hands and fingers of a violonist or the tuning of a Helmholtz resonators or an EQ digital or analog or a specific way to spoke a language ...
Then calling "musicality" an arbitrary meaningless word derived from marketing is not false but it is not true either, it is confusing the informed meaning of the words with the uninformed use ...
Your description refer to the gear consumers reviewers not to his more constrainted use in music and small room acoustics courses or in achitecture of great Hall were musicality had a different more precise meaning ......
It is not because we cannot correlate a word to his objective complex set of parameters that the word means almost nothing save an opinion ... There exist informed opinions ...
"musicality" has nothing to do with the branded names behind gear choices, here the word reflect a mere buyers opinion... Like all the cliches about tubes and S.S. or analog versus digital etc ...
"Musicality" is clearly not a technical term - how could it be? Of course that applies to a lot of audiophile jargon, to varying degrees.
Best to keep it simple. I think it usually means "I really like this", or in the context of direct comparisons, it can be applied to one component to put the other component down "softly" - rather than a flat out "I think that one sounds bad". Unfortunately most of us spend too many words skirting around what we REALLY think of something.