It is rather arrogant of you to say that the creator of this video is just having a 'rant' at the Thai language. If you'd have paid attention to the video, you would know that he specifically said that Thai wad one of the most "complicated writing systems" not 'hardest language to learn'. You yourself stated that Thai has a lot of rules to learn in order to write it and your main point in favour of it is that "it is spoken exactly how it is written". That is not a point in favour of the simplicity of the writing of the Thai language. Everybody would know how a word was said in English if we moved from the Latin alphabet to IPA, but regular speakers would fine that ridiculously complicated and clunky to read and write.