Four color cards (that is: hearts are red, spades are black, clubs are green, and diamonds are blue) would help with accessibility in a few ways, and even without any disability, are my much preferred way of looking at card suits.
Much easier to tell at a glance what you're looking at, and it's happened more than a couple of times when I'm sleepy that I've mistaken clubs for spades or vice versa with the default filters and pixelation.
Please consider this feature! Apologies if it's been asked for already; I did a search and didn't find anything.
Edit: it would ideally be a toggleable option, of course. Not the default.
Edit the Second: I am aware that spades and clubs are slightly different colors and it has still happened to me! Needs more contrast. Hearts and diamonds are much more distinct to my eyes, but may as well go full four color.