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This is a good point. I think products like these have strong network externalities (more the number of people use it, more beneficial they become). For this reason, a new product may not replace an incumbent product even when the incumbent product is slightly inferior. I spent a lot of time learning and using ConTeXt. Wrote one of my articles using that. When the time came to send it to a journal, they wanted it either in Word, or formatted using their LaTeX style files. At that time I gave up on ConTeXt, since I did not want to keep learning and using two different systems.