Congratulations OP, you have reasoned yourself into transhumanism! To me the argument the OP described is one of the best ways to come to human-augmentation advocacy because it becomes obvious that we should be using technology to improve our capabilities.
To delve more deeply into transhumanism from this perspective, I would caution to not get preoccupied with current transhuman threads which are largely based on prosthetics and physical limitations.
Rather, I would look more towards nootropics and other technologies that help maintain or improve brain function and technologies which help reduce biases. In my opinion there is not enough being done to help the average person make better decisions on a daily basis, though there are some things. The fact that this is becoming a discussion point is great!
edit: I should also mention that the field of behavioral economics positively emphasizes the idea of "nudging" people toward better decision largely through design.