Some Android phones can now be used in desktop mode too (such as Samsung DeX). I think it is not yet common maybe, but I think it has great potential. When used in desktop mode, one would prefer to plug in a mouse and keyboard while using it (which is what I always do). When I plug them and use it on a big screen, the UI of Opera can be nothing but struggle when used with a mouse, all those swipe gestures that are comfortable on a touch display become very hard to do. 1st, I think Opera should be able to automatically switch to tablet UI from mobile UI when desktop mode is being used. 2nd, Opera Mobile should support shortcut keys, such as ctrl+t, ctrl+w, ctrl+tab, ctrl+shift+tab, ctrl+f, alt+left arrow, alt+right arrow... The mouse gestures on Opera Desktop is very helpful, even that can be added for the desktop mode in the future. If can take your time to try using Opera Mobile on a phone in desktop mode with mouse and keyboard, it will probably not take long for you to understand what I mean.
Thank you for making Opera, the awesome browser. It is a pleasure for me to give suggestions to you:)