Personal opinion here, but I really hate the largification of everything just for the possibility of touchscreens. I've learned to deal with small buttons and the zoom function in my browser. Bigger elements and buttons just bloats up the screen and diminishes PC browsers to basically the mobile version of webpages and makes everything look bloaty. Unity at the expense of clear oversight.
I don't like it because in the emphasis of responsive GUIs we sometimes neglect devices with precise pointing capabilities.
On the other hand, can you blame them for focusing on the devices that are most commonly used today? Desktop is becoming an enthusiast and business platform.
I doubt it, it's just to not have to make 2 standards, but it just makes desktop use bloated. Even if it was for poor vision, then we still shouldn't do it by default unless suddenly over half of the population starts to see bad, and at the very least then make it opt-in or opt-out, not forced. 😬
If it wasn't the default, people with poor vision would most likely wouldn't even know how to activate it by themselves.
Most regular users, especially older ones that are more prone to these conditions, aren't technically savvy enough to rummage through app settings to learn how to toggle accessibility features.
They'd just try to put on reading glasses and then struggle to use the app as it is.
I think it makes more sense to have sensible defaults like that be activated and make it opt-out for those that don't like it