Because last I looked, most of the developed world continues to struggle with unemployment.
Hmm, the USA considers "full employment" to be roughly equal to 6% unemployment (which we're pretty close to now).
Note that the "workforce" they're talking about is essentially everyone between the ages of 18 and 65.
Now, once upon a time, (immediately post-WW2, for example), the "workforce" did NOT include most of the women of the country. Which means that percentage employment has nearly doubled, using the 1950 definition of employment.
If we applied the modern definition of unemployment to that period, we'd say that during WW2 we were running probably 35-40% unemployment.
In other words, change the definitions, get different results.....