Flatpack, appimage, snaps..

what are devs trying to do when creating snaps and flatpack?

Appimages are great for what they do. They'd be even better if we had convenient means of distribution. It's easy for an intermediate-to-advanced user to go find the thing on some website, download it then chmod +x it.

A regular user, in contrast, finds comfort in centralized software repositories, where you only have to enter an app's name and click install. Gnome and KDE, with the help of Appstream, provide Flatpaks for your convenience through Software and Discover, respectively.

It's worth mentioning that Alexander Larsson (Flatpak) took some inspiration from Simon Peter's (Appimage) klik when he was developing the precursor to xdg-apps and Flatpak, glick... What a mouthful :) Cheers!