You are right in saying that discoverability has suffered much, by hiding scrollbar and similar changes. Also, you need to move the mouse precisely
to a particular spot to re-enable the scrollbars, there is little wiggle room,
which may may things harder for handicapped people, older users, or people
on the move (e.g. me on a train).
Yeah, e.g. when you have a very short scrollbar and had to guess where it is for more than 5 seconds...I'm kinda grow past that hype, nada, going back to Winux.
It is SUCH a pity that they have extraordinary hardware (even with the price point I'd still consider it a bargin, especially for the air/mini)...