This is really strange behaviour to left previous file loading as the basic behaviour. Suppose i have a HUUUUGE lagging file which i cannot handle and its ruining my workflow i just close the plasticity. and i want on my second opening that it will be clean and clear to start thinking about how to handle it. But no. Now i must wait another half an hour. This is irrelevant thinking.
Thats why all softwares all over the world starts from blanc.