Recently I downloaded an AppImage for digiKam. It immediately crashed when trying to open it, because I believe glibc did not work with my system version (a recent stable Ubuntu).
Last week I needed to install a gnome extension. The standard and seemingly only supported way of doing this is to open a web page, install a Firefox extension, and then click a button on the web page to install it. The page told me to install the Firefox extension and that worked properly. Then it said Firefox didn’t have access to the necessary parts of my file system. It turns out FF is a snap and file system access is limited, so the official way of installing the gnome extension doesn’t work. I ended up having to download and install chrome and install the gnome extension from there.
These new “solutions” have their own problems.
They can lead eventually to "Microsoft Linux Store". Canonical pushes snaps for a reason and they are partnered with MS. Flatpacks essentially follow the same route and can be embraced, extended and extinguished, and we'll be left with bare kernel+glibc distros and the rest available for 20$ in Steam/MS/you name it store