One of the most successful tandems ever was Jordan and Pippen. Aren't they as similar as Tatum and Brown?
I think what get conflated is if the question is if they are perfect together or and they bad together. I think it is easy to say that they are not perfect together but that does not mean that they are bad together or that there is some problem Bad tandems don't win titles. Brown and Giannis, for example would potentially be a better pairing than Brown and Tatum. Kind of like Jokic and Murray are a great tandem. But Brunson and Towns are the same blueprint but not all that successful.
I am perfectly happy with Brown and Tatum. There are potentially slightly better pairings, but not many. Brown-Jokic or Tatum-Jokic? Sure. Tatum and SGA? Sure. Are there really that many others?