You and I must have very different ideas of what the word "extremely" means.
> walking away from the property is always an option
That is only true in twelve states. In the other 38, the lender can sue you to recover the difference between the house's value and what you owe even after they foreclose.
I only use non-recourse mortgages when investing in real estate. YMMV.
Real estate is only one investment vehicle where you don't need a large amount of capital to realize substantial cash flows. Whenever possible, seek out leverage opportunities.
I've known several people who wanted to "get into real estate" so they bought duplexes and became landlords. All of them lost money or broke even because they went into it without doing their due diligence. My parents ended up just walking away from their "investment" property and declaring bankruptcy, that's how much they lost out. It isn't buy property -> profit like people think.
Leverage cuts both ways - it magnifies both gains and losses.
[1] I personally know at least three people who sold houses for less than the bought them 7-10 years later. My parents have owned their house for 25 years and while the dollar value went up it hasn't kept pace with inflation (recently got three appraisals) even though they have cared for it and even added an extra bathroom.