"As LCD screens have advanced, designers have taken advantage of their increasing resolution by using lighter typeface, lower contrast, and thinner fonts.
But when you design in perfect settings, with big, contrast-rich monitors, you blind yourself to users.
To arbitrarily throw away contrast based on a fashion that “looks good on my perfect screen in my perfectly lit office” is abdicating designers’ responsibilities to the very people for whom they are designing."
https://www.wired.com/2016/10/how-the-web-became-unreadable/