Flatpak and Snap definitely make installation more simple. The packages come with their own dependencies so you have way less issues with conflicting dependencies. I like them when they are officially supported by the distribution or developer, but I prefer the official installations over supporting a random person making a package (not sure if this is a thing with Flatpak, but with Snaps that was definitely a thing).
Some software really benefits from not begin inside flatpak though, I had to switch back to the deb version of Visual Studio Code as the integrated console didn’t have access to some software outside the package and was also logging weird errors.