You cannot skip these steps, of course, when you want to replace the display (which was the kind of repair we did).
When putting the little connectors in place again afterwards, I can recommend to hold the connectors to the display using a little rubber band. That way, they don’t get in the way when you put them in place one by one.
The suggestions that recommend skipping step 13-19 apply to some other repair. We replaced the display, and to do so, steps 13-19 are, of course, necessary.