For me, having this deep understanding that our time is relatively short allows me to be grounded and focussed on legacy, and not on acquiring material things mindlessly. 

Very very often those deals fall through and much more importantly, they have very deep pockets and very low cost of capital, so they can absorb the losers.

If you want SUPER easy you can move into a class areas where return and cash flow will take a deep plunge.

Long story short, after working extremely hard, I was promoted from the warehouse to Counter Sales, then dug deep into learning as much as I possibly could through training classes on the products, because if I am going to do something I'm going to be the best, I was promoted to management about a year ago.

You're right - his perspective was that diversification is for ignorant people, and that he preferred to understand a particular industry/company really deep, and make bets based on knowledge and research.  

I read a great article from Joe Fairless on How to Select a Target Market and am deep in the Marcus Millichap, CBRE, and other reports to get a broader understanding of the key metro and secondary markets.

That said, your post implies you will be deep into SEC territory without knowing it.

Polybutylene had some failures back in the day but if it hasn't failed by now you're probably good.LP siding had big problems in the 90s but there again most of that stuff has wasted away and the new stuff is pretty good if properly protected with paint.Not a construction material but any house used to manufacture meth or even grow weed will have potentially 10s of thousands of dollars in remediation.And then of course there's the occasional house I come across where someone deep fried a frozen turkey... 

They did appear later that day in camouflage outfits & the youngest (last hired) guy got to go down the 20ft deep cylinder to pull the motors while 4 guys stood around, 2 covered in blood from a recent kill.

A seller is not going to accept 65% of the value of his house because your using a deep radio voice lol to be fair there is some merit to his negotiating tactics .doubt your agent will even submit such a ridiculous offer !