This is a mischaracterization. "chromium-browser" is a transitional package that installs the chromium snap for one reason: it is to provide an upgrade path for users of Chromium in previous Ubuntu releases to the latest Ubuntu release without breaking Chromium.
I use an example of where Debian does the same thing: on the latest Debian release, install "mysql-server" and you'll get MariaDB, not MySQL. Granted this doesn't bridge across from a deb to a snap, but the mechanism is the same and the technical reasoning is the same. It is to stop users from ending up with a regression in available software following an upgrade.
There is no "to make it some "universal installer"" going on here.
You may not like the decision, but please do not make it out to be for reasons that do not exist - at least without providing the facts to allow readers to decide for themselves.
(I work for Canonical but don't work in an area related to the Chromium snap, Snap Store, this decision, etc. I speak for myself, and not Canonical).