The issue is that no Ubuntu is not “the Windows”.
First of all this statement makes no sense. You could say “the Samsung of the Android world” as Samsung Android is a Distribution that looks nice and many people think it is nice to use (leaving out that it is the most spyware-riddled software on locked devices with horrible customer treatment)
Windows is just one OS.
Ubuntu is not easy anymore. Distro upgrades are a mess and break. I had 12 laptops, all had the same 3 issues and updates took forever.
Ubuntu requires a sudo account for them to even work, a nonsudoer gets an update message but clicking it does nothing.
They have their own strange icons, which look worse than GNOMEs. They have their own strange store instead of using and improving GNOME Software.
Snaps are not cross platform, while Flatpak exists and is cross platform. Ubuntu doesnt even have uptodate flatpak and dependencies in their repos so the Flatpak project maintains like 6 PPAs just to run them on Ubuntu.
They only ship KDE on the LTS variant, which means by now it is very outdated. KDE is the most windows-like desktop, and also has the most features, by far. I tried GNOME and made a writeup on Fedora discuss.
They bloat (at least) their (LTS) variants with tons of deb packages.
Snaps installed by other users with sudo cannot be opened by other users. You need to install them per-user, no other option possible.
Flatpak requires wheel/sudo too, I need to make a Fedora Change request to fix that, my previous one got rejected…
They dont integrate timeshift or other backup systems. Linux Mint and OpenSUSE are better here. Fedora Atomic Desktops too, while traditional Fedora not.
Their design sucks in comparison to Manjaro if you ask me. Most personal point of this list.
They support Unity???