Ask HN: Opinion of thinking of startup ideas vs. not thinking of startup ideas?

Paul Graham states that not thinking of startup ideas leads to good ideas. Whereby, one develops a way of thinking of ideas unconsciously. Thus, the idea of working on side projects because they're plain interesting.

The other alternative is to constantly think of startup ideas. PG warns against this mode of thinking.

What is HNs opinion on thinking of startup ideas, vs. not thinking of startup ideas. There are many examples of successful companies using the latter strategy, but are there examples of successful companies using the former idea?

Overall, which is the more viable strategy?