I've just started hanging all my shirts. Basically I have a set amount of coat hangers. If i want a new shirt I need to sacrifice another. It also makes drying way easier. Out of the washing machine, onto a coat hanger, onto the washing line, straight into the wardrobe once dry.

Some clothes do better hung up.

Read vs Write optimization.

In stacking case, it is "expensive" to Read, I mean choose and pick and put the stack back so it aligns nicely.

Plus folding the shirt in the first place takes more effort.