Although the pad is smaller, the caliper has less flex in it, and has a better clamping force onthe disk.

That combined with a slightly bigger disk gives you better brakes

I suppose that it's not just down to the pad area, but the force on the pad. (As well) ie if you had two tiny Pistons, you would need to push twice as hard as if you had four similar pistons, on same pad.
I'm remembering my old physics teacher now showing us the hydraulics theory of small moment on large piston, equals large movement on smaller piston, but used the other way around. And anything is lift able, with just one arm movement, repeated.. Ie- a jack..... but the stock large piston, is perhaps a similar surface area as the four smaller Pistons.
I'm not doubting the advantages, I was just highlighting what they might actually look like next to each other. I've seen six pot calipers on an old jag once.
I've an old jag 420g it's a huge car, with disc brakes, and front pads around 40mm square. I've upgraded to later brakes, front and rear, there are things there to calculate, with master cylinder barrel bore, as the front rear balance can be compromised. (Not driven it yet!)
interesting subject though.

where Brembo brakes a factory upgrade or standard on some models ????????? 57 - Silver TDV8 VSE loaded
12 - Grey VW California Berghaus

Brembo four pot callipers were introduced with the 2007 upgrade , removed for the 2010 upgrade and then six pot callipers came in with the 2011 upgrade . 2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid windows.
magnus satis quod turpis satis

ok cool cheers ...learning so much about my RR on this forum  57 - Silver TDV8 VSE loaded
12 - Grey VW California Berghaus