You're not going to push anywhere near 50N with your finger so not all those levels will be relevant.
nobody is going to come close to their 11lb maximum pressure level in real-world use
You're forgetting about drumsticks. 50N may not even be a sufficient limit for a satisfying drum pad experience...
And I would imagine people with smaller fingertips and strong hands could easily hit 50 newtons typing if they tried... although that'd really be banging on the keys.