> maybe system thinking is really complex and thus hard to convey and use.
I'm pretty sure that's not true. If you can follow how A leads to -> B, then that's about it all. Systems thinking is the same principle at a larger scale, with interesting side effects at times (eg network effects/group think/emergent phenomenon showing up).
I have to admit that it was very hard to me to follow what they were saying.
Maybe I’m dumb, maybe the person didn’t explain it well, or, maybe system thinking is really complex and thus hard to convey and use.
Design thinking on the other hand is easy to understand and apply.