Very true and good points, and when it comes to snap I mostly agree with you. I would guess the "war on Ubuntu" going on is more due to Ubuntu's history of making controversial decisions that go against the grain of what most other distros are doing at the time (creating and dropping Mir, creating Unity instead of using GNOME and then switching back to GNOME when they finally got Unity working well, installing an Amazon app out of the box in one version), many of which angered a lot of Linux community members before who are still angry despite Ubuntu rolling back most of those decisions, and they've found snap a great current scapegoat issue to use to vent their long-standing frustrations with Ubuntu at.

EDIT: I also notice to a lesser degree a weird fanboy-ism around Flatpak which I think also contributes to it. Pretty much when Flatpak came out the attitude was, "this is the standard for containerized binaries, no alternatives or exceptions will be tolerated", and immediately they went on the warpath to destroy both snap and appimage (though to be fair appimage really isn't great).