Your intention is still to pass on the knowledge though regardless of traffic otherwise why even publish if it’s just for you? What is the difference from the Documents dir at that point?
I can stay in my browser and use Google, DuckDuckGo, or even my on-site search (I use Apache Solr, I'm a little weird compared to the typical hosted blog) and don't have to go into some webapp or search on some local notes app.
I can also add permalinks to any of the posts from anywhere, and share them in public documentation or bug reports and such, a handy feature.
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.
If you nominally have an audience (if you feel like you do, regardless of the reality), you'll perform differently, same as with speaking. This may be a good thing.
I can also add permalinks to any of the posts from anywhere, and share them in public documentation or bug reports and such, a handy feature.