Good points. Quoted in the dedicated snap forum thread. Snap Store / snaps / snapd / snapcraft.io - a new software source? - #6 by Patrick Please redirect further discussion on snap there. Leave a link here if relevant.
Would also appreciate an opinion on flathub in https://forums.whonix.org/t/flathub-as-a-source-of-software/10706 as this might also turn out as suitable software source for Firefox and/or Chromium.