I'm mostly with you with one exception. If there's one thing that may be objectively evolved, it is the power of the raw human singing voice. With all its expressivity, dynamics, range, colours, individualism, and overtones.
I claim that anyone who studies carefully the pure sound of the voice and what it is capable of will always hear synth vocals as superficial. (I don't care genre, whether it's opera, art song, jazz, blues, hip hop or vocal music from any culture).