I think people get nervous about talk like this because the "make everything muppet-proof" movement has gotten so much traction in the wake of Android and iOS.

UI designers are empowered, and "power" technical and business users suffer for it. My iPad is easy for my two-year old to use... But it is horrific for more many types of tasks that computer users do every day.

Firefox definitely carries a lot of config legacy... But going too far the other way is dangerous too.