In comparison, modern windows doesn't even hide its inconsistencies. Try right clicking on the desktop in windows 11. You get a dropdown with large item spacing and rounded corners. But then if you click "Show more options", the dropdown is replaced with a different dropdown with subtly different menu items, small spacing and sharp corners.
They aren't even pretending any more.
This isn't Kai's photo goo we're talking about here. This is core windows.
Unless you opted out, basically every application in the 90s and early 2000s was built using the core platform's UI library. There were a few exceptions, but the 90s were a golden age for platform consistency compared to today.
Now its hard to find any 2 applications on windows which use the same UI style. Firefox and explorer? Nope - the maximise and close buttons have a different style. Spotify? Nah thats some custom webview. Visual studio? Nope, thats using an old windows library. Whatsapp desktop? Qt. Intellij? Some java thing. And so it goes. Its an absolute zoo.
They're pretty fast to create, relatively consistent, simple and fast/easy to create.
That's not what people want, they want all the flexibility and features of say Gmail or maps. B along with some communication and flexibility. Not to mention running on every OS under the sun, and being able to use accessibility and screen reader tools on all those platforms.
Uh, no you can't. Web forms aren't rich enough to build most desktop applications. You can't make vscode, gmail, slack or spotify using web forms. They're just a bad set of primitives for applications. (In the web's defense, it was never designed as an application platform).
Yet - we had some version of all of those applications in the 90s, on every OS at the time. And (mostly) using the platform's built in UI libraries so the look and feel was consistent and delightful.
I can't speak to font sizes since IIRC that was an option but I left it default.
I taught courses on VB from versions 3 to 6 and this was always something we went over.
IMO the fact that someone cared enough to make a site about what is largely nitpicks like this shows exactly how these stood out in the otherwise consistent landscape of UIs in the 90s.
Nowadays such a site would have 99% of every application released. It could even be automated, just somehow track all new .exe files in GitHub, MajorGeeks, Softpedia, etc and add them automatically to a hall of shame list, chances are even without human supervision the overwhelming majority will be correct :-P.
My experience had been that most (almost all) of them _only_ worked with a single font in a single font size and a specific window size. If you did change any of these, it got unusable.
About consistency: except for those that didn't, not even MS themselves were consistent. http://hallofshame.gp.co.at/shame.html
The 90s had been also the time of programs like Kai's Power Tools https://mprove.de/script/99/kai/ and Winamp.
I'm sorry, but "interface consistency" is not something that comes to my mind when I think of 90s and early 2000s Windows programs (neither was Linux). Irix with 4DWM had been quite consistent at that time.