People are like books ,they are all similar from the outside (their appearance) but their content are different. Most of the times, the deeper the reader reads in a book, it will be more interesting or in some cases a reader decide to stop reading a specific book because it is not interesting. The idea can be applied to any conversation too.
The depth of a conversation is not measured by the time it starts and finish, but by how it effect the people who are communicating, for example if the conversation is about things that do not really matter to a person or dose not effect his life, the conversation will still be shallow even if it took hours or more,but if a conversation is five minutes but it has the effect of changing the perspective to the better, I consider it a deep conversation.
I know most of the relationships start with shallow conversations but the problem in my opinion if the conversation stayed in that level forever, that means the people who are talking together are not really communicating. Communication is really important for any type of relationship.
I think a person should read many kind of books, books that talk about different subjects and a reader should read all kinds of books even ones that contains opposite ideas than the ones the reader has. I think this way let’s a person have strong opinions about different things in life and the reasons of why he has those specific opinion about any specific thing, he won’t be just copping others just because he is sitting with them.
Make sure your existing makes a difference for the better, in the place you are in.
I think people are should be similar to fiction books they tell others their opinions not like unification books, the try to tell fact all of the times.