This is an important point - single platform apps for Windows and macOS or iOS or Android behave and look much better than cross platform apps let alone browser

This is an important point - single platform apps for Windows and macOS or iOS or Android behave and look much better than cross platform apps let alone browser based apps. I will put up with less functions for the better feel. However many people want to appeal to more users or program in Linux or web and so have a default cross platform GUI anyway (or make it cross platform easily)