The problem: the Ubuntu app store will no longer install ".deb" files, only Snaps. If you are a Linux "power user", this isn't much of an issue, Ubuntu is still based on Debian package management after all, and you can still use the "apt-get" command in the CLI. And you can still install FlatPaks.
But as Abhi points out, this could cause problems for people looking for an alternative to Windows or iOS. They are now pretty strongly locked-in to the Snap format and the Ubuntu's official app store unless they bother to learn about and install alternatives.
I think I am going to start recommending Fedora or Mint as my best Linux distro for beginners from now on.
I'm feeling so conflicted about the idea of installing Ubuntu 24.04 LTS. It looks pretty, modern, and something I need in my life right now!
However, a lot of the programs I use are Windows-centric. I don't want to mess with Wine or finding alternatives (which is something I normally wouldn't mind doing). At least this version will be there when Microsoft inevitably buggers up and forces my hand once again.