I do not understand the need to never-leave-the-browser especially with modern window tiling, but I respect it as a preference that other people have. As for syncing I just use file sharing (Syncthing), I hardly live collaborate on documents and if I did everyone else in the group ended up doing the typing. Otherwise it’s write then get reviewed then reiterate. So unfortunately nothing about the online text editors really strike my fancy. I also find the browser almost too distracting and often get sidetracked while using it for research during writing time.