But in some circumstances it's not necessarily that the consumer is trying to cut time and effort.

For instance, if I'm out and about doing stuff and happen to want some sliced mango. It's not that I decided in advance not to buy bulk mangoes and slice them at home, I just decided spur of the moment to get some.

Of course there are people who don't like slicing mangoes themselves, so for added convenience they will buy pre-sliced mangoes and bring them home or wherever specifically to eat them.