This may not be an issue many people think about, but about 8% of the male population is colour blind (about 4.5% of humans total). Colour blind usually meaning you have trouble distinguishing between red and green. Despite this being a fairly high percentage, my partner, who is colour blind, frequently encounters board games and video games he cannot play because they rely on colour vision. An easy example is Uno, where you need to play either a matching colour or number. If you can't tell apart the colours, it's very hard to play.
So kudos to this new print of Uno for adding those little symbols for the colour blind:
I will also thank Ticket to Ride for using symbols as well as colours:
There are several boardgames that I have marked with permanent marker so my partner can play them. It's a small added design feature to have symbols matching colours but it makes a big difference.

















