Larger trigger guards allow room for gloved fingers.
You might be surprised by all the little things that get considered during design, like that.
While not a firearm related thing... I have seen recordings of Dieter Rams talking about design of products... And if you don't know who he is.... Well, he is probably the greatest industrial designer there was, and inspired pretty much all of Apple's designs over the last 15 years.
The amount of attention he placed on even the smallest details was extensive.
I would imagine any top level firearms manufacturer, working on new designs, would do the same.
And I love the paddle mag release on the M1 PPQ, and HK stuff...
After about the second mag change, using my trigger finger, it was ingrained in me. So much easier to use than a push button. My hands will not reach a button on any pistol 9mm and up without adjusting my grip.
I love the paddle so much, that I lament my pistols that do not have it. To the point I swap them to the other side of the frame on any that I can. (I used to do a similar technique on my XD I had 10 years ago)
It really seems a superior method, at least for most people. Some may have hand shapes that preclude it.
Those that don't like it, I wonder if it's simply tradition and resistance to change that fuel the dislike.