The problem is that delamination is not tested with your hand. Among others things, I am designing and assembling 3D printers and there are numerous cases when the part had to be redesigned and made beefier in order to sustain the mechanical stress. In some cases the thinner part showed unacceptable wear during testing; in other cases it happened after the machine worked for a while and the stress broke through the part. As a side note, in particular elastic filaments such as NinjaFlex and nylon are very hard to delaminate as the object is also elastic, but that's a different story.
However, I am not the debating type, if you consider that 2 layers that have a too small contact area cannot be delaminated, that's ok.