Do Active Speakers Belong In A High End System?

If you want a professional to design and integrate your amp and speakers for you, its a very good way to go. If they do a good job, the results will be "high end". No reason to doubt that the reputable companies out there that offer active speaker products cannot get it right. Whether you like it or not is a matter of personal preference. At that point its as high end as anything I would think. Technically, I guess there will always be other options out there that cost more so those might technically be considered more "high end" FWIW.

All live events, even pure electronically amplified ones, have the equivalent of a soundstage and imaging, in home audio jingo. What varies is its nature case by case. In some cases, there may be similarities between what is heard live and what is heard at home, but that is never a given case by case. In all cases, what you hear is determined largely by how things are setup, venue acoustics, and location based perspective of the listener. If what you hear at home can fool you into thinking it were actually live with your eyes closed, in at least some cases, you are in the game. If it never does, then you either do not care (which is everyone's prerogative of course) or something may be amiss.