That argument is tantamount to saying that the EDM genre has stagnated since the 90s after your above listed musical instruments were released.

Hi, I'm not literally suggesting those are the only important instruments. People sometimes truncate examples in suggestions. The assumption is that if someone likes the idea, they could extend the pattern.

Many people would say it has.

Half of top ten Techno Beatport tracks, site where EDM djs buy music, sounds like Phuture - Acid Tracks from 1987.

It was made with a 303 and a 808, maybe a 606?

Sub genres always stagnate, if it changes to much it becomes a new sub genre

Yeah I would find this more interesting than the current tags e.g. IDM which is such a nonsense/confusing term anyway.

Not sure if Musique Concrete on one side or Venetian Snares on the other used those instruments.

Like every single other electronic musician Venteian Snares has used the 303, 606, 808 and 909 in their tracks.

Original, clones, emulations, or samples, that does not matter.