You lost me here:

ceramic tile 1/4 of an inch

coats of plaster - regardless how light will be much thicker and heavier.

What did i miss?

The problem here is that having multiple coats, just for the structure prevents/impairs the understanding of the more important function of the coats - such as control of "moisture saturation"

anything thicker then 1/2 of an inch can only be used on the wall or panel with minimum size of 15-20 sq foot.

else it keeps too much water or if moistened lightly "drinks" and evaporates water too fast to paint properly.