Has anyone seen this video series?
Killegar Chess Presents: "My System" by Aron Nimzowitsch
How important is "My System"?

By the way, how does one get to NM?
By not reading "My System"
Very astute

You'll probably find the annotated games just as interesting as any concepts he tries to teach. All of the most important concepts are assimilated into other works. Others seem to find his writing good, I'm not a fan of Nimzowitsch as a writer at all.
Same goes for me but it was the first chess book I ever read, probably when I was about 13. It isn't necessarily thought well of but it's a seminal book and GMs will want to read it even if they disagree with some of it.
I don't like it either, I don't like Nimzowitsch's writing style or his similaes to real life, he's also kind of passive aggressive. I still can't figure out what point he tries to make about what he calls "hanging pawns" or how it's meant to be useful.
I think Tarrasch's The Game of Chess is the best book for learning the main principles. Honestly I think the whole "hypermodern revolution led by Nimzowitsch" was just a bunch of nonsense. Sure controlling the centre from afar turned out to be better than had been thought, that's not really a revolution, plenty of things turn out different to original theory.
For what it's worth Nimzowitsch came from a wealthy Jewish family, which I found out many years after forming my opinion and it might answer a few questions.
"... Just because a book contains lots of information that you don’t know, it doesn’t necessarily mean that it will be extremely helpful in making you better at this point in your chess development. ..." - Dan Heisman (2001)
https://web.archive.org/web/20140626180930/http://www.chesscafe.com/text/heisman06.pdf
A My System sample can be seen at:
https://www.qualitychess.co.uk/ebooks/MySystem-excerpt.pdf