I think the world language should be a "neutral" language that belongs to no country, religion or political idea, and is extremely easy to learn. English is illogical in many ways and hard to pronounce for lots of people.
I agree with you. There is a problem that the difficulty of artificial languages strongly depends on one's mother tounge. For example, Esperanto is easy for speakers of Indo-European languages, but it is still difficut for a Chinese. Phonology of such languages is an extremely difficult issue.
I asked about Mutko's speech because I wanted to understand how accent influences the comprehension.