I totally agree with this post. The industries mentioned are/were transformative. Picking the right company from the multitude of companies within that industry is the tricky part. However, performance is based on the whole portfolio, not just one or 2 stocks. Its not unusual for example, to have a portfolio of, say, 10 stocks (using baseball analogies) with 5 being strikeouts, 3 or 4 singles, and a homerun in there that makes the portfolio have an overall good to great performance over a period of time.