20 years ago software wasn't as much battle tested as today, had way less feature set, was less connected to the internet, and etc. 428 CVEs looks small, assuming not all have CVSS 9.8 or something.
>That said, sure, it had a fraction of the features back then, and only a fraction of the world population was connected to the internet.
And the world was better for it. Connectivity and internet are not inherent goods. They can be used for good purposes but it is hard to argue that has been the mean.