Ummm, no. That’s not what the Pareto principle states, and even if it did, it would be a ridiculous metric for designing either hardware or software.
Even if it’s true that most of your users only use 20% of the features 80% of the time, which 20% gets used varies widely between users - and even then, few users are going to be happy with stuff that only works for 80% of their use cases, no matter how fashionably ‘minimalist’ it claims to be.
But what if other users define “key printer functions” differently than Rensch does?
If you can’t design an easy-to-understand, pleasant product without eliminating (whatever you imagine are) “non-key” features, you’re not a very good designer.
