If it where that simple then why all the furore over this?
There are many reasons, some valid others less so but I will let someone else draw that conclusion. What I can say, without fear of contradiction, is that the crew who flew the aircraft prior to the Lionair crash dealt with the situation using electric trim and cut out switches and they landed safely, writing up the defect.
Draw from that your own conclusion.
The use of the electric trim stops MCAS trimming and then there is a five second pause. This is without using the cutouts. Again, draw your own conclusion.