[started writing this this morning, but hadn’t the time to hit that reply button. I am sure @guga made a lot of points I’ll be making 
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For starters, it breaks the suspense of disbelief.
Again, you are building something contrived around god-mode/‘w’ to win. That is not the same as brute forcing.
Secondly, it doesn’t allow me to try to come up with the solution. And that basically sucks out all the fun for someone who likes to play adventure games the way they’re intended to be played: by experimenting.
Like I said before: that does open the possibility to brute force ones way through, but really most players only resort to that shamefully.
I don’t agree.
Do you think more people will enable “invulnerability” if it is in the options screen of a fps or say Mario Bros?