Yeah that's also true, to a degree. Clearly, there are interesting challenges that I would have never been faced with had I stayed at a startup.

But I also found that once you reach a certain level of expertise at $BIGCORP there are few opportunities to try to push the boundaries of your domain knowledge, lest you are dead-set on taking initiatives and swim against the current of a rigid organisation. That may just be specific to my job and employer though.

And while the part about navigating internal complexity is true as well, it's harder to highlight on a CV than "I have worked with technologies X, Y and Z". At best you can say "I have worked with X at a big corp, and also Y, which you probably don't know because it's an internal tool." You just have to hope that the name of your employer alone carries enough weight on its own.