Actually 98% of my photos will never get printed at all and I think this is true for most photographers. So 1:1 on a monitor is the way I look at them. Of course I also zoom out to see the whole picture, but they should look good at 1:1. My displays still have HD resolution or even less. So defects on a pixel level are visible. I opted against a 4K or even higher resolution display, because I want to see pixel level defects at 1:1.
I don't print* any more, and I check images at maximum magnification for some purposes - culling and fine editing. But I hope you can appreciate that when the vast majority of people view an image, they - view
an image? They look at the
whole image, they don't zoom in to a small section of it to check the effects of diffraction, motion blur, unsharp mask, etc. I do sometimes on other people's pics, out of curiosity, but most images that look good as a whole have defects viewed too close. It doesn't matter, because that's not what image capture is for, except maybe in a few very technical areas. Think of it this way - you might like or dislike a portrait, but basing that on whether the fine pores are visible 1:1 is esoteric at best. Comparing equipment on that basis is even stranger.
*printing is rather irrelevant to this discussion, but you brought it up. The same principles apply to making an image your desktop or phone wallpaper, viewing it on social media, etc.