I’m just wondering if I’m the only one having this issue. A few releases ago, the font size severely shrunk. I tried using system font settings, but that didn’t work at all, so I turned it off. I used the font slider and cranked it all the way to the biggest, but it’s not nearly as big as the font used to be. I even went into accessibility and tried increasing the font size on a per – app basis. That didn’t work either. 
That’s the system font at its largest. I don’t believe I’ve changed the base which is 15pt for body text and 17pt for titles which is what’s suggested by Apple.
I’ll double check though and I’ll see if I can make the slider in-app go higher without it breaking the layout.