Yes, some cells had to die in order for the spike proteins to be made, but the spike proteins do not go on to repeat the process the way a "live" virus does.
Are you absolutely certain that the hijacked cells die and release the spike proteins?
Are you absolutely certain that none of those cells express the SARS spike proteins on their surface and possibly train the immune system to recognize those cells as invaders and start an autoimmune response?
Even if you are absolutely certain they don't, are you absolutely certain that none of the current mRNA versions set up for a cytokine storm when a real infection tries to get a toe hold?
Before you answer, please recall that the animal trials in 2006 and 2014 resulted in massive fatalities when they were challenged with the virus six months later.
Don't you have a plane to catch?