I wrote something about this in another comment just now, and while cracks in eggs with holes weren’t frequent, they still happened for me. I have been taught to poke holes in when I was young, and just always did and assumed it was needed. Now I stopped and nothing changed, basically. But it also means I have no point of comparison for how often they used to break without having poked holes, since I just never cooked them like that in the (distant) past.

There’s also no real downside to poking holes either, so why not if it might help. I have just misplaced my hole-poking-thingy anyway, so that saves some space in my drawer and not having to get a new one.