In what cases would "e.g." be better than "for example", aside from when you're desperately short on space? Most of the cases I see "e.g." and "i.e." -- with o

In what cases would "e.g." be better than "for example", aside from when you're desperately short on space? Most of the cases I see "e.g." and "i.e." -- with or without the dots -- it means "I'm putting zero effort into putting these phrases together into a clear sentence."