Well, since I don't consider (personally) Golarion as being anything like Earth, real world comparisons have no meaning to me. It isn't medieval in nature as many people seem to equate it to (in my version only) Civilization is more advanced in most places and in many different ways than would be possible on earth. Better hygiene and diet would extend life spans, especially with the possibility of medicines and medical skills available. On and on there would be countless differences. This is just my take on it.
Magic is a much more permeating force to me and is much more a part of the world. Something like and yet unlike and in addition to the electromagnetic field. We use these lines of power and have nodes where they intersect the strongest and spell engines to utilize them. The great arcane colleges and smaller schools use these to create magic much more easily. In some of the more advanced and civilized nation, as well as ancient ruins sometimes, we have civic works and other various magical items/effects/works. Many places have nothing like this and many people have never seen anything magical at all in the less advanced places of the world.
Some of my reasoning has little to do with rules and more to do with the fact that a.) Arcane power is much easier to tap in my campaign for those trained and skilled in it, b.) Wizard don't always die with their boots on. Some go on to teach or retire but still need funds for continuing their studies and interests. They sell their skills to large cities/wealthy individuals/etc., They invent things and sell copies to those that can afford it and any other money making enterprise that is possible. Some legal and ethical and some not of course.
I like more magic in my version of fantasy. It's not for everyone and it's not taken in the same directions as Eberron. But it works for me.