you can install firefox, but even if you click ‘make firefox my default browser’, it won’t. It will open the settings, wait a second and then show you another button. Clicking that will do what you wanted - for web links. Pdf files? Html files? Searches from the start menu? Still all open edge.
On ubuntu it takes maybe a minute to remove the firefox snap, add the mozilla repo and install from there. Those dummie packages are more for convenience than anything nefarious. I agree that snaps have been made unavoidable if you’re not paying attention, but I disagree that it’s a bad thing. Ubuntu is migrating from .debs to snaps, so it makes sense that those become ever more prominant.
They technically do tell you, even in the graphical software store. And the speed difference between snaps and debs has been largely nullified by now.