That post doesn't come across as anything but pure elitism, it makes no real point and just claims "yeah system and free fonts are just worse".
Fonts like Roboto, Fira, Open Sans, Ubuntu, Merriweather or Vollkorn are all "professional grade" font families with lots of variants and options. Basic typesetting knowledge is going to get you much much further than buying a random professional font if you're designing "a document".
Fonts like Roboto, Fira, Open Sans, Ubuntu, Merriweather or Vollkorn are all "professional grade" font families with lots of variants and options. Basic typesetting knowledge is going to get you much much further than buying a random professional font if you're designing "a document".