Well there’s not ‘endgame’ here. Originally, after they realized that the wax/shellac cylinder and disk could be useful for more than simply dictation, audio equipment became the means of bringing performances by famous musicians to more people than could fit in a music hall.
Along the way the sound quality improved to the point where people started realizing that maybe this was more than just a way to hear scratchy, nasally distorted recordings of their favourites and could reproduce instruments in a convincing enough manner that one might start to think they were in the room with them.
Add to that the desire of many to tinker with technical things and the tinkering itself became the ‘endgame’ as such.
I have to say, one of the few types of equipment for audio reproduction which has actually improved over the years has been with speakers. Newer, lighter materials for cones and panels, in the case of electrostatic types and a more science-based approach have helped immensely I think.
I’ve not sampled all vintage speakers though, and I’m sure there were some truly great ones.