5e's Bounded Accuracy already nuked that a lot with making modifiers greater than +10 require magical equipment or level 19+.
With a max proficiency of +6 and a max ability score modifier of +5, the absolute maximum any character can roll without magical gear is 21, and even magical gear is limited to +5 bonuses at most and normally only grants Advantage. So the DCs are almost never going above 24 for an 'impossible for mere mortals' check.
