I don’t believe either is the primary driver of modern UI design. Cynical as it may be, I think the only things that get any level of thought are:
1. Which design is most effective at steering the most users to the most lucrative actions
2. What looks good in screenshots, presentations, and marketing
The rest is tertiary or an afterthought at best. Lots of modern UI is actually pretty awful for those mentioned bottom of the bell curve users and not much better for anybody else in terms of being easy to use or serving the user’s needs.
Proper use of analytics might be of assistance here, but those are also primarily used to figure out the most profitable usage patterns, not what makes a program more pleasant or to easy to use. They’re also often twisted or misused to justify whatever course of action the PM in question wants to take, which is often to degrade the user experience in some way.
1. Which design is most effective at steering the most users to the most lucrative actions
2. What looks good in screenshots, presentations, and marketing
The rest is tertiary or an afterthought at best. Lots of modern UI is actually pretty awful for those mentioned bottom of the bell curve users and not much better for anybody else in terms of being easy to use or serving the user’s needs.
Proper use of analytics might be of assistance here, but those are also primarily used to figure out the most profitable usage patterns, not what makes a program more pleasant or to easy to use. They’re also often twisted or misused to justify whatever course of action the PM in question wants to take, which is often to degrade the user experience in some way.