It's the Canonical way, just as with Mir, Upstart, Unity, and a bunch of other NIH Canonical projects.
A commonly repeated lie.
Mir, Upstart, and Unity all precede or are parallel to the other project. While Wayland technically existed when Mir was created, Wayland wasn't very active at that time. Upstart was replacing init, systemd was created later and draw inspiration from Upstart. Unity was replacing Gnome 2, Gnome 3 was released a year after Unity and was a mess. Finally, Snap and Flatpack are more or less parallel, both solving a different issue, with Snap being a more system-level solution such as for drivers, IoT, while up until recently, Flatpack couldn't handle command-line apps at all, concentrating solely on GUI apps installed through GUI appstore.