On the use of buffers as a placeholder for tabs

[willhansen]

At this time, we do not yet have tabs. (#7109)

We do, however, have the bufferline, which kind of works like tabs a little bit. It shows what other files are open, which have unsaved work, and (when enabled) is always visible on the screen for at-a-glance reference. We can't click on them yet though (#4942)

As I understand it, one of the primary arguments against enabling the bufferline by default is that users see it, think it works like tabs, and then complain when it doesn't. (#5316).

I think the root problem there is that the bufferline looks a lot like tabs, so a new user looking at it for the first time will be all like "oh, it's just tabs", and then have their reasonable expectations betrayed.

I think displaying the bufferline at the bottom of the screen instead of the top would be the easiest way to fix this problem, and open the door for enabling it by default.