Yes, the forum software shows current “best practices” and the menu icon is exactly where you expect to see it… and the resulting menu pops under the icon, it doesn’t slide in from the right or left.
My observation is that this icon on the OGS site get’s hidden from normal view because it is either confused with another graphical element (the OGS logo) or it’s not in the corner people normally see it.
So while the menu icon (three bars) is common enough, its location is suboptimal and get’s missed by users, which is a bad feedback loop. Older users are blind to the problem because they’ve become used to it; “Doesn’t bother me,” they say. Of course not, you’ve been trained to find it and now it would feel odd it was moved. This ends up being the only logical reason not to move it… existing user habits.
You can’t just put the menu glyph anywhere you want and think it’s going to magically work. For example it doesn’t even have alt text, so you can’t hover over it and get a tool tip telling what it is (try hovering over it in this forum to see what I mean.)
Even stranger is that the entire logo brings up that menu, not just the three bar glyph. What is normally a way back to the home page (clicking the site logo) is now a navigation tool to bring up more options… without any indication that this is the case.
BTW, I did try using a arrow and a triangle pointing right, but these just seemed to make the confusion of the glyph being part of the logo worse and didn’t look like navigation elements at all. You can try it yourself with a little on page editing.