It is very easy to say that common languages are good when you already speak that common language.

Common languages are great when you've reached the point of doing the job, but they cause extra burden on large parts of the world population and are a barrier to entry for poor people.

One response is to say "Let's teach a simple international English to as many people as possible". Another response is to say "Let's create excellent quality documentation, and then translate this into the majority languages." These need not be exclusive, we can do both.

My misplaced anger you see in this thread comes from my perception of the tone of the 'learn English' side.