To add to this, let me make an observation, too: selecting the outline ("Stroke") effect (which is ideal, as that makes the fonts visible on any backgrounds) seems to use a slightly different font color for the interior part of the font - less saturated, more washed out.
For example, it is quite visible if you set the font color to yellow. Without any effect, or with italic, etc., the font color is vibrant, well-defined, properly saturated - definitely yellow. However, if you keep the yellow color but use the outline/stroke effect, the yellow color becomes very washed out, weak - it's almost white.
(As for black backgrounds, as long as that would be a newly added, extra option, it's okay - but certainly not as something added instead of the outline effect, as that would be terrible

.