I'm not sure it can go on and on. I already answered your questions, and you didn't get it, so there's not much more to say.
Okay let me try again. Broadly speaking, you can divide the physicists into two groups.
The first group of physicists say: The stuff exists, only if observed. The question then arises, who is doing the observation? Not necessarily you. Reread my earlier reply to you.
The second group of physicists say: The stuff exists, without observation. They explain the double-slit experiment in other ways. For example, that particles can affect each other at the speed of light regardless of distance; or that
we exist in multiple different dimensions etc.
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And that, in a nutshell, is pretty much it. The answer, I quite understand, is perplexing, annoying and delusional to you, because it's not what you perceive reality to be.
My four-year-old probably felt as indignant as you now do, when I first explained to him that there are very tiny, invisible living things in our surroundings that can make people sick and make milk go bad. Come to think of it, Louis Pasteur must have gotten a lot of flak too.
But that's science for you. I can't help it if you're not inclined to think scientifically, and keep saying, "Forget the theory! Ignore the theory!" etc etc.