Back in the day, when music in the theatre manifested itself dramatically as dance and singing together — specifically ballet and opera — it did so in a myriad of different forms. Though we now call them opera-ballets (or even just operas), they can be difficult to imagine now that the two art forms are not only separate themselves, but tend to have separate audiences in many cities, sharing only their theatre in common. Conveniently, but unfortunately, the choreography has been lost in all cases and the works are revived as what we now call opera in the main. A dance of course is much more difficult to write down than music — though written music is not itself trivial, in fact, baroque composers had no desire to write down every note, and quite a bit of the creative act we now assign to composers was originally given to musicians and singers, ornamentation in particular, were and are very important and in most cases these improvisations were not thought to be written down since that would defeat their whole purpose of expressive dramatic spontaneity. These baroque operas, even the French ones of Lully and Rameau in which the dancing is particularly important, are first and foremost watched and listened to today as opera, even when some care, attention and time are given to recreating the choreography.
“Modernized Opera” can sound a little scary, especially if implicitly (mis-)associated with the term “upgrade” which came out of Hollywood and Silicon Valley almost simultaneously in the last several years. Perhaps this is why some people are so against it: it sounds as if their changing the notes to modern notes! Or completely reversing the tone of the opera in some sardonic way. Operas should not be modernized because they are old but because it makes sense to do so. The two terms in quotes shouldn’t be associated at all: the former is a style, the latter a consumerist slogan and a euphemism for dumbing-down. Bringing the action of the opera into the present either explicitly or in some less realistic or even abstracted way, where there is a motivation, can be a wonderful thing and be high art. When the imagery the designer and director create make poetical and musical sense in the way it unfolds through the piece, with its own internal logic compatible with that of the music, it is a wonderful thing and there is no reason modern images are necessarily excluded from this (there is the problem of literal contradictions in the libretto, references to “pastorella” or “boschi” or “selva” in an opera taken to the modern inner city, but those are a separate matter).