Some reasons Miami Vice was different and can never be repeated.
1. It literally had to invent style. Miami in 1983 was dilapidated and not the "cool" place that the TV show depicted. It's almost as if the TV show led to Miami's renaissance. No other TV show in history has done that or will again.
2. It wasn't preachy. It dealt with some difficult subjects at times, but never did it in a way that was the writer telling you what to feel. "Evan" was the best example of that. It laid out the scenario and let the audience decide for itself. Ever since the 90s, most shows are infested with "social justice" types that ruin virtually any script they touch. I literally have stopped watching some recent shows for that reason alone. It also takes away from a "timeless" aspect to be preaching a current morality.
3. The 1980s was a cultural and technological renaissance in the US and we're still living in it. Miami Vice was a part of that. Nothing on TV or movies these days has that kind of impact. But 1984 was at the beginning phase of it. There will be other cultural renaissances in the future, but I doubt television shows will be a thing anymore.