A search engine tries to find all sorts of relevant information related to your query. The more the merrier (it’s searching after all) and then sorted in a way that puts the relevant results first. An answering engine, in the other hand, tries to minimize the number of results. In an ideal world, it would only return one thing, which tells you exactly what you want.
One example of this change is the fact that it’s no longer useful to go beyond the first page or so of Your results. Because anything down that low is irrelevant as an answer and is probably discarded by google anyways, which wasn’t the case when it was a search engine.
I’m not saying this is a bad thing. In fact, I suspect the majority of time the majority of people want an answer, and not a multitude of results. But I think this is what leads to google search changing in a way that does not meet many people’s expectations here.
It means google emphasizes stuff that gets people answers quickly. They parse text and reveal the answers on their page itself. And they are not very useful for exploring anymore.