That's the thing - that method exists but.. it's not default, and something as simple as resizing a window should be seamless by default without the need for hacks.
As a hacker, I love Linux to bits and it beats OS X and Windows in a crazy number of ways. As a user (and it's a hat I proudly wear quite often) I find the UI glitches infuriating, especially as it makes it so hard to recommend to other users I know (because I'll inevitably get the "why can't I resize windows properly?" question 100 times a year).
As a hacker, I love Linux to bits and it beats OS X and Windows in a crazy number of ways. As a user (and it's a hat I proudly wear quite often) I find the UI glitches infuriating, especially as it makes it so hard to recommend to other users I know (because I'll inevitably get the "why can't I resize windows properly?" question 100 times a year).