Re: What's the zen behind the left side of the window titlebar?
Because in maximised windows, the buttons would look pretty stupid on the right of the indicators. You'd also be left with blank space there when the window wasn't maximised, or the indicators would move depending on the state of the window - either way would be terrible.
So the buttons go on the left, where there is space above the Launcher.
Why is the Launcher on the left instead of on the right? It's because you can control the mouse better, the closer it is to their center. Basically this means that, for right-handed people, your mousing is more precise when the cursor is on the left side of the screen. Hence, the Launcher goes on the left of the screen.
The Launcher doesn't go on the top or bottom because that would restrict precious vertical space on a widescreen monitor.
The truth is, virtually nobody changes the order of window buttons in Unity so they are on the right-hand side. The reason for this is that maximised windows will ALWAYS have their buttons on the left-side of the top panel regardless of the setting in dconf. This has always been the case in Unity.
I work in a place that has fleet cars. Some of them have their turn indicator switch on the right-hand side of the steering column, some have it on the left-hand side. The first or second time you might get it wrong and the windscreen wipers come on, but you adjust fast. I installed Ubuntu 14.04 today and found that the Back/Forward buttons in Nautilus have moved somewhat. The first couple of times my mouse went to the wrong spot, now it doesn't. Because I adapted.
Frankly, if you've been changing the order of window buttons to the right side every six months since 2010, you've been putting yourself through a lot of work to avoid adapting. The window button order is very trivial to get used to. Just stick with it. After a few hours you'll always go to the correct corner.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.