This issue recently came up at the en-WP Village Pump. It looks like this came up during the development of packed mode here. But the decision to just ignore it doesn't really make sense—as Dvorapa said above, if there's a gallery with 4 images and 3 per line, it should go onto a second line. At some point it would need to override the setting, as we don't want tiny images, but that's what it does already with the widths and height parameters, which it treats as suggestions rather than requirements. The behavior should be the same here.