Silence, Zoolander.
Size and weight is at the extreme bottom of priorities as far as lenses are concerned, unless you're dealing with super telephotos.
You expect me to carry 120 more grams around?!?!?! Noooooooooooooooooo!!!!!
Haha Please.
Jeez.
I'm sorry that is complete nonsense for many people. Size weight and cost are real issues with the new RF lenses, sure a couple of hundred grams might not make a big difference on one lens, when it all adds up and makes the difference between carrying three lenses instead of four lenses it has real impact.
Personally I love the EF 35 f2 IS and own it over the EF 35 f1.4 II L because of size, weight, and cost, oh, and the f2 has IS.... I could buy the L, easily, but then the EF 35 1.4 II L is 15oz more than the f2, that difference between the two lenses is three quarters the weight of my EF 100L Macro! Sure for a couple of hours it makes little difference but for long hikes, big trips, travels, or vacations it makes the difference between taking a lens with you or not.