i think what he is trying to say. is we cause any of the stress factors that cause many of the problems we have when growing. if you just start the plant out in the pot you intend to grow it then there will be no need to transplant it and no need to cause unnecessary stress
i have also found that many times we over look the enviromental conditions when we have a plant problem. its not the ph its not the mg soil we are using. if we grow a plant for 8 weeks and then have a problem it is most likely we let it get to hot or we moved the light closer thinking we helped.
the humidity might be lower because we added the extra fan thinking we were helping. so before you go asking anyone why my plants is yellowing or wilting or such look at what you did over the last few days and i am sure you will hae changed something and that is the cause of the problem we stressed the plant.