I certainly understand you perspective as i too have cruised solo and it is entirely different. I think the difference is for me I am constantly working with people and enjoy the “down” time when I am cruising. I can be social and join in at meal times and when I want but it is not constantly in my face.
I do miss the big libraries, but never thought the shows were great, and yes the food was more varied and creative years ago, and the service was more attentive, but still enjoy the whole experience.