> I think high information density === high intelligence.

Just packing loads of stuff on-screen at once, with tiny fonts and tiny margins and all the rest presents a lot of accessibility issues, even for intelligent people.

Google et al are adding padding and white space to make their UIs more accessible for more people. It's not just eye sight we're talking here, but also physical issues with clicking/tapping small targets accurately (e.g. someone with Parkinson's), and also neuro divergent issues where a page full of text or whatever can disorient just by sheer amount of stuff happening on-screen at once (e.g. epilepsy)

You can be very intelligent, but still benefit from well-designed and accessible UIs. Don't assume people who need it are less intelligent.