I just recently bought a new ASUS 541 laptop to my wife.
Though she does not have problems with the Endless OS Linux GUI (after Win10), she really wish to use the Opera browser, as it is much more lightweight and faster than Chrome or Firefox. Chromium is nice, but as she told, the Opera on her old laptop runs smoother that the Chromium, Chrome or Firefox on this (we tested all three).
( BTW I showed Opera to 8 different people in the last months, and especially on smartphones the people are amused how easy to use and fast this browser. Certainly it is my preferred browser on all platforms)
Opera has a Linux and Linux64 version too, but installation of the package is not allowed, due to the known reasons.
What is required to add Opera to the App manager and get a proper Flatpak release? As I understood, it is not so easy.