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On the contrary, the most popular Tanjiro ships are either GiyuuTan or RenTan, among the new recruits, TanIno/TanGen and TanKana should be the more popular ones to the shipdom. The same with UzuZen on Zenitsu side.
Although to some degree, TanZenTan is indeed quite popular with the Japanese fandom. They even have their own couple petit hosted by Akaboo even (the petit name is ??????????? if you're curious). But other than that, i haven't seen ppl talking about TanZenTan that much.
