I don't find that to be true. I remember many of my co-workers... some fondly, some not, but they are remembered. They added as much flavor to my life as my family and friends, if not more, because we spent more hours together. Their work influenced mine and I learned from them. And their insights helped direct which directions we took the projects.

Now, did our presence impact the company? Did our code survive? Or documentation? Do people who work there today have any idea we ever existed? No, perhaps not. But really... who cares? The relationships we have with people in our lives matter, as do the impacts we have on each other, regardless of what our impact was on some rando corporation I earned a check from some number of years ago.

This is something I've discussed with my colleagues that I've worked with for a long time. At the beginning when the company was smaller the group worked so closely in developing the fundamentals of how we make our products that even those that have left still have left a lasting impression on how things are done even if their names aren't associated with it any more. At some point that dwindled and now it is far less likely that someone makes that lasting impact, even a few months after they leave their contributions are just kinda forgotten.

I have to wonder how things will change when the last couple of us from those days move on, as we are the last links to that time.

One of the constants in this field is the people; I've continued to work with the same individuals in various environments and configurations for decades - often intentionally.