kittenkaboodle

yup you cannot get a tourist visa if your intent is to migrate, thats why you need to prove to the officers that you will only come here to VISIT and if they're not convinced and they sense that youre lying then theyll deny you.
you're entitled to your own opinion.

There is nothing wrong in visiting and subsequently changing your mind after entry and adjusting status.

There shouldn't be any problems at all. As long as the forms are legible, and complete. I know it says Capital letters, but I believe they understand on that one, that people make mistakes. I used a mixture of the smaller and capital letters on my I-864 and everything cleared without a problem.
Hope that helps!

Maybe you didn't say what you meant, then. Because what your post sounds like is that you are suggesting that the OP get a tourist visa, apply for a fiancée visa at the same time, and then while it is processing come to "visit" on the tourist visa, marry, and stay.
Adjusting from a tourist visa IS legal if there was no intent to immigrate. OP has already stated they DO want to immigrate so they can't use a tourist visa for that. If they can get a tourist visa they can use it to visit and return home while their K-1 or CR-1 application is processing but NOT to file a 485.