Because their ideas and conversations are shaping your mind and making you less mentally free.

That is why, when you have a solution A and you read someone else's "better" solution B, for the same problem, you will often be tempted to alter your solution.

That might be a good thing, if their solution is truly better. But it means that you now have the same solution and nobody will have a choice of solutions.

What if someone comes along later and they have a problem that would have been solved by your "worse" solution? We will never know because you never built it.

This is how innovation dies a thousand deaths.