I´m looking for an addon that can change the ingame fontsize of all fonts.
Since Im playing @ high resolution changing the ingame UI Scale to make the font readable makes the Interface Windows too big.
If the windows are too big at a size where the font is legible, then the windows may need to be that large in order to fit the text anyway.
You can get something like MoveAnything! and only use it to scale some frames larger.
You can get addons to modify each individual area of the UI you would like to modify the text in. (Chat, tooltip, etc.)
"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh