Earlier quoted context omitted.
There are keys to control when these snap updates will happen, https://snapcraft.io/docs/keeping-snaps-up-to-date It is immutable systems that help you with reproducibility. There is no actual change between the snapd setup in Ubuntu 18.04 and Ubuntu 20.04. Where do you get info on unreliable docker deployments? It looks to me that the dislike is emotional in nature.
I use chromium and firefox inside the docker with selenium to automate website tests. So them replacing the chrome apt with snap was exactly what broke my deployment.
It is too fragile to install yourself all the pieces.