To me, it doesn't make sense to assign a draw as 1/2 to Black and White. Technically, neither side won, so why not just throw that game out when looking at which side wins more often? That's what I do in this analysis, although I show the full breakdown in the final area plot.
A game in which for evenly matched players, in a match of 1000 games, 9 are wins for white, 1 is a win for black, and 990 are draws. Would it really be reasonable there to say that W has a massive 90% advantage? I don't think so - in that situation white only has a tiny average advantage per game, so that winning such a match would mostly depend on real skill differences.
Also note that even in a match, where players alternate colors, Black should be happy to draw and take White in the next game, while White would be disappointed with that result. So it is worthwhile to keep track of draw results even if they are thrown out.
When researching openings, players often take into account how well an opening has performed in the past. There's a large qualitative difference between White 60% Black 40% Draw 0% (60-40) and White 12% Black 8% Draw 80% (52-48), although the fraction of decisive games won by White is the same in both cases.
This means the weaker player has a benefit from a draw, while the stronger player drops rating points when drawing a weaker one.