Manage the people and the machines will take care of themselves. Machines cost money. You would think this point would be obvious, but it is amazing how often we forget it. You can buy the fanciest hardware around, the whizziest, fastest, coolest stuff available, and it won't do anything until you tell it to. If you don't have answers, don't buy it.
Fashion is fickle.
Technology today is as fashion-conscious as a designer's walk in Paris or Milan. You'd think Vogue was required reading, the way some organisations decide technological issues. RISC is hot, CISC is not. Mainframes were in, then out, now in again. AI was, was not, sort of is.