I think the question of whether this is interesting is based on assuming the author is Chinese. This assumption isn't unwarranted, given information on the About page.[0] For example, he participated in the China National Olympiad in Informatics and he's attending Tsinghua University, in Beijing. Given how sensitive cultural assumptions can be, I'd like to make clear that I'm very clear that this is pure speculation based on circumstantial evidence and more than happy to learn more about this and be corrected as needed.
From my reading, traditional characters are still in use in China (distinguished for the purposes of this discussion from Taiwan).
Traditional characters are used informally in regions in China primarily in handwriting and also used for inscriptions and religious text. They are often retained in logos or graphics to evoke yesteryear.
An application name is not all that different from a business name or a logo. Given this, choosing to use traditional Chinese characters (in this case 太極 in contrast to the simplified 太极) is consistent and not necessarily unusual. Of course, this is all speculation without hearing from the author.
[0]: http://taichi.graphics/about/
From my reading, traditional characters are still in use in China (distinguished for the purposes of this discussion from Taiwan).
Traditional characters are used informally in regions in China primarily in handwriting and also used for inscriptions and religious text. They are often retained in logos or graphics to evoke yesteryear.
https://en.wikipedia.org/wiki/Traditional_Chinese_characters...
In trademarks and business signs, TC is common.
https://www.quora.com/How-do-people-in-mainland-China-feel-w...
An application name is not all that different from a business name or a logo. Given this, choosing to use traditional Chinese characters (in this case 太極 in contrast to the simplified 太极) is consistent and not necessarily unusual. Of course, this is all speculation without hearing from the author.