This. Amazon no doubt has reasons to buy land that it _might_ want to use for warehouses, etc., but they are also just stuffing money into real estate because it's an inflation hedge. The very beginning of the article admits that they were in competition with hedge funds for some of their purchases.
I partially agree with you. Specially with inflation coming out way.
But I rather exclude gold and buy assets with cashflow only.
I agree, most assets in any portfolio should have associated cash flows, commodities are sprinkled here and there for the sake of diversifying though.