You go your way and have the decency to allow others the same privilege. Eh? You've made your point.
He actually gave a really good advice. Sure, technical aspect of photography is great to know like exposure triangle, inverse square, diffraction, and so on. In the end, photography is about your vision compare to someone else. You can ask Internet experts about this and that or go out there and find the answer yourself by actually doing it. You can remember all the technical and composition rules of photography and still produce a technically correct but bland picture with no "feel". It's a good reminder that there's more to photography than aperture, ISO, shutter speed. So, don't get all too caught up...
IMO, encourage every student to get as "caught up" as they wish at this point in their studies. Why not? This is the time to explore. It is not the time to be told your questions are worthless and a waste of time. If "this" interests you now, explore it. Is there such a thing as too much knowledge? I don't think so. So don't discourage enthusiasm by discouraging curiosity. Whether the point made was good or bad doesn't matter here. This isn't a thread about the mysterious processes of creative spirit. There will be plenty of time for that - in another thread.
Let's say you were a educator working with young students in a ... oh, let's say, a philosophy class. A very young student comes to you as the instructor and asks about a topic which they find interesting based upon a class you taught last week. They would like to know more about Aristotle and Plato and the relationship between the two men. Would you tell that student they would be wasting their time doing such research? Or, would you suggest the student follow a suggested direction in their study of the two and they could get some extra credit in class? Possibly make a report to the class on what they find? Would you essentially shut down the student's inquisitive nature? Or would you encourage it?
The op is asking/trying to gain a higher understanding of light. Read the title to the thread. They are trying to comprehend how a lens works. Light? Lens? does that sound like something which might benefit a student of photography?
I don't disagree with the idea that technology should not supplant creativity. Yet, I can see a clear link between a better understanding of a lens and creating better, more emotionally connecting images through that lens.
Just because you have an opinion is no reason to express that opinion, just because. No?