This stands to reason. If you need the answer to a question, and you can either get it directly, or spend time researching the answer, you're going to learn much more with the latter approach than the former.
You may be disciplined enough to do more research if the answer is directly presented to you, but most people will not do that, and most companies are not interested in that, they want quick 'efficient', 'competitive' solutions. They aren't considering the long term downside to this.
Actually, for most things (not PHD research level) you will learn more from the first approach. Getting answer directly means you can use the rest of the "free" time to integrate new knowledge into prior knowledge and review the information into long term memory.
Your comparison with chess engines is pretty spot-on, that's how the best of the best chess players do prep nowadays. Gone are the multi person expert teams that analysed positions and offered advice. They now have analysts that use supercomputers to search through bajillions of positions and extract the best ideas, and distill them to their players.