For example, flat Earth theory (flatness of small ereas on any surface). What is wrong with this theory? Very accurate (all farmers, realtos, designers, students, civil engineers, laymen, construction workers, etc. use it on DAYLY BASIS having NO PROBLEMs - there are no FAULTS in it. Correct, true and accurate.

So does QM, GR, Newtonian gravitation, Newtonian motion, Galilean transformation, Lorentz transformation, evoution, Big Bang, inflation and thousand other theories. They are very accurate and proven by ALL observations.

So, you are incorrect, there are plenty of correct theories around.