My very first post was specifically discussing quality of life, especially arguing that making everybody equally poor doesn't make for a better society. And that is in fact what GP was arguing against, though admittedly my second post did go on a tangent, but that was because of the few points the article makes about civil equality (i.e. mention of voting rights.)
I understand what your point was, but it was refuting a strawman argument no one made. The article does not state the world is better off because wars reduced income inequality. It merely states the wars reduced income inequality. It then goes on to say it will be much harder to reduce inequality in peaceful times than it was in the middle of the last century. It does not make any claims that we are worst off because of this, only that we will need to work harder to reduce inequality without outside factors which made it easier in the past.