With how small the text is in games like GTA V, everything turns out blurred and unclear. I accidentally spent $4, 500 on a car because of that.
Africa_Whale, via Reddit
Small text size is a very common complaint amongst people with vision impairments, whether medical (such as long sightedness) or situational (such as small mobile screen). Allowing a choice of font size is the ideal solution, but as this is difficult to implement, setting a large default size is a good first step. Amazon TV have 10-foot-UI guidelines that include text size recommendations, of 28px minimum when viewed on a 1080p screen. That 28px is for any users without taking vision impairment into account, so aim to exceed this wherever possible.
Small fonts are not only difficult to see, they are also more difficult to read for conditions such as dyslexia, due to the differences between letter shapes being less pronounced at smaller pixel sizes.
More information: Amazon TV UI guidelines