The compounding wealth impact of that forced appreciation, cash flow, perpetual principle pay down (and long-term market appreciation, to a lesser extent) allow some investors to not have to worry or focus heavily on all the ....flations mentioned (it provides more freedom from those concerns or uncertain market forces).

My gut tells me the cash flow gain over 5 years of rising MFH rents won't hold a candle to 150K a year (compounding each year too so really more each year) worth of capital gains via appreciation I get with SFH. 

Yes, any small expense, repeated regularly, can compound over time.

One big reason is that properties held in S corps or LLC's taxed as scorps (wait whaa, yeah LLC's can be taxed as partnerships, S corps, and C corps) when transferred have to leave at market value which might be a problem if you bought it for 100k and now its worth 180k because, thats a 80k gain you got on your hands when this property is transferred (unless if you transfer or sell it to yourself at cost basis).The other reasons is like most people said regarding self employment taxes and avoidance of them in totality.Another reason is you may not want to comingle your liabilities of your buy and hold properties with your active business (wholesaling, flipping, consulting, etc) which may compound your risk for lawsuits.However, to the contrary I see tons of S-corps with investors or LLC's taxed as scorps for flippers or people who use their scorps for active businesses like hard money lenders and flippers.The benefit of Scorp is that us conventional lenders like to see income surrounded by a veil of s-corp legitimacy even though its only a couple pieces of paper filed with the state.

You are getting a 100% match, and all but the very best real estate investors are likely to underperform a return of 100% compounding at 8% per year going forward.I go on to discuss this in the book, but I absolutely DO believe that most people should take the match with their employer.

Simple or Compound Interest?

You should use the next 4 years of your life to look at knowledge as compound interest and consume education at a faster pace than your competition. 

I have read painters say the best way to “remove” wallpaper is to skim coat with drywall compound.

For a $250k house, that extra 2% to 4% of annual appreciation makes a big difference over time, especially as it compounds. 

RE is the only investment where you can gain compounded returns, without having to spend any money.