well gnome software and epiphany app stores just work.
click, install, done.
they provide an option to pick the source to install from (package/flatpak/snap), but they both automatically pick the best one for you.
Debian/Ubuntu almost never break on updates (unless you mess with the PPAs too much), but at a significant cost: some packages and software (especially desktop environments and system packages) being 1-2 years out of date.