Elephant in the room: adding support for flatpak

[All3xJ]

I'm quoting an answer of another github issue:

I understand the desire to have a “one-stop shop” to find software, however the goal of this project is to provide the best out-of-the-box experience on Ubuntu. We believe that snaps provide the best combination of security and usability for Ubuntu users and our priority is to deliver a tailored, intuitive and accessible way for users of all experience levels to find the apps that they need.

For users who are looking for a more generalized store, we recommend gnome-software, which will continue to be available in the Ubuntu repository and is designed to be compatible with a wide variety of packaging formats, including Flatpak.

I understand this, but if you say "the goal of this project is to provide the best out-of-the-box experience on Ubuntu", well this is not the case. Because if a user (like me) uses Ubuntu and wants to use both snap and flatpak, is forced to install another app store if doesn't want to operate via commandline.
This is NOT the "best out-of-the-box experience on Ubuntu".

Also, if Ubuntu (and I understand this) wants to "push" a user to use snap, you can still do this. I mean, you can just leave everything as it is, so by default only snap is enabled and app-center only shows snap and debs.
Then, IF and only IF the user wants to install also flatpak, then app-center "detects" this and starts showing also flatpak results (as THIRD choice, in order to push for snap and repo as first choices)

Why not? This app-center store is VERY good. I mean, it's much better than gnome-software-center, so why you prevent a user to have everything in a single store?

[ricperry]

Ubuntu store only supporting snaps is not the best out-of-box experience though. MANY popular apps only have partial support (if any) for snap, and their websites explicitly recommend the flatpaks or appimages.