Do all apps take account of dynamic text (e.g. is there a requirement on app design) or do many developers leave it off? The reason I ask is I am considering coming back to iphone from android (for the 8 plus) but my eyesight is such that I would need to set the font size to a larger size. For the default apps when checking in store this is mostly ok (although imessage is still on the small side) but I am not sure if 3rd party apps will scale too. On android nearly everything scales – not always nicely, but at least the font always gets large enough to read.