The problem with Chicago 95 is that it is not consistent. Check the padding/margin on these buttons:

https://raw.githubusercontent.com/grassmunk/Chicago95/master...

Now compare to these:

https://raw.githubusercontent.com/grassmunk/Chicago95/master...

Or here:

https://raw.githubusercontent.com/grassmunk/Chicago95/master...

Everything is off. Compare to the real thing:

https://external-content.duckduckgo.com/iu/?u=http%3A%2F%2F4...

https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F...

Or compare to SerenityOS. That's good UI work.

Those Chicago95 screenshots might be a bit out of date. Some of the systems I use have the latest Chicago95 on them, and it either doesn't bother me, or I'm so focused on doing things in applications (or on anything but the UI theme) that it doesn't bother me.