The most annoying thing to me is the Calendar one. Sometimes you just want to quickly look at a date and you can't unless it's in the current month.
That's probably one of the more annoying things to me.
2.4GHz chips are lower power and smaller (and way slower). Luckily you can often create two separate networks and have both 2.4GHz and 5GHz at the same time.
Oh the humanity. It even comes complete with the obligatory ‘post Jobs’ jab.