I beg to differ. The most useful kind of zoom zooms the entire UI and this is straightforward to do on Windows and ChromeOS in increments of 25%. It is possible in Gnome, too, (again in increements of 25%, at Settings > Displays > Scale), but it is not straightforward because before you can do it, you have to say, `gsettings set org.gnome.mutter experimental-features "['scale-monitor-framebuffer']"` once per install of the OS.
None of them exhibit the wonky behavior of zooming a web page described above.
Huh. I expect user-interface surprises on web pages. Interacting with the other user interfaces in my life is much less surprising.