Ah, the debate about this will continue forever.
I understand your point of view, mostly because it used to be mine. However, at some point in life you may find yourself in a place where ONLY believing and acting and thinking in ways that are accepted and "proven" by the general public just isn't good enough for you anymore.
It is EASY to believe and trust in things that are tangable. Things that you can touch, feel and see. It is NOT as easy to believe and trust things that are not so tangable like your best friends loyalty to you, your spouses love, your child's respect, the concept of spirituality, faith, etc.
You get to do whatever you want with your life so it's always your choice, but I have found some of the most fulfilling and happy experiences in my life donig things that required me to venture outside of things that are proven and commonly accepted.
For example, financially speaking, statistically most people (about 95% of the population in North America) will work for 40-50years of their life and retire broke. Less than 5% of the population will retire at a standard of living higher than just above broke. About 2% will be extremely wealthy. Learning that when I was younger I decided that I did not want to be part of the 95% that would be broke all their lives.
So, because I realized that, i needed to accept the fact that if I wanted results that are different from 95% of the population, I would have to be prepared to THINK and ACT differently from 95% of the population. That means that I would have to do things that aren't proven. Things that aren't accepted as normal.
In fact, in most cases I had to do the exact OPPOSITE of what the rest of the crowd was doing. When the stock market was booming, I was investing in the underpriced real estate. When the real estate market was booming, and stocks were crap, I was putting money into stocks. When all my friends went to school, I went to work. When they started working for large corporations with big salaries, I started working for myself. When they went to party, I went home to read personal development books.
None of those things showed me any PROOF that I would be better of pursueing them. In fact, in most cases the opposite was shown. But, I listened to my intuition and pursued my own path, and now I am SO much better off than most of my friends who followed the "path of least resistance"
At some point, you're going to have to decide how much faith you put into the pre-established ways of thinking that the rest of the world already believes in, and how much are you going to put into your own intuition, and new ways of thinking. For me, thinking differently has paid off.
To summarize, I have chosen to take the path in life where I seek my dreams, even if they seem impossible or improbable. I have chosen to try new things and put my faith in them to see if they work. In some cases I got burned, in MOST cases I came out well ahead of the game.
Yes, if you take risks, you may find yourself bankrupt. So what? Start again, and keep moving forward.
If you DON'T take risks, your pretty much guaranteed to get nowhere.
If the safe path works for you, stick with it, but the reason you're seeing the other parts of LoA discussed that you might find "unproven" is because a lot of us have chosen the path of taking some risks and trying things out EXPERIENTIALLY as opposed to just using our logical mind to try to figure out what would work or not before trying it.
Remember that no progress is made if we simply think and act in ways that we've been thinking all our lives.
Just my point of view.