While I agree we are re-learning lessons from ages ago and reinventing the same tech, I believe the problem comes from the desire to manage the same data with different software. On desktops, imagine your photo library that you might view with one set of programs, modify with another, try out a completely new one to make videos out of photos...

As soon as there are multiple programs with full authority on your data, "cybersecurity" happens. And internet/web is that to the power of 100.