You are implying you can mimic all the required processes and not end up with too much or too little macro/micro nutrients.

This is not possible due to nature's complexity. Until we will be able to use nanomachines to analyize individual proteins and cells we won't know how the body works on a global scale so you will end up with incorrectly guessing how much micro/macro nutrients the meat will have.

Over time artifical meat will be a disaster as far as nutrients go, saying that you can "grow good meat that can compare to natural meat and has all the required nutrients as natural meat" is arrogant and shortsighted, but I don't expect anything more from modern scientists.