That's a bit like saying history about CSS1 is irrelevant because now we have CSS3, they're just different parts of the same history.
Same with electronic music from hardware and electronic music from software. They're a part of the same history, just different parts.
Of course, the latter probably wouldn't exists without the former, most music software emulates what we already were doing in hardware after all, albeit a lot more flexible.
It's also way more fresh, even I as a youngster (~30y) can remember that, compared to all this initial hardware innovation where I wasn't even around to experience.
That said, I'm sure there are plenty of articles about the history of DAWs and plugins, is there not? If there isn't, sounds like the world is waiting for someone like you to put it together :) I for one would read it for sure.