I hate to say it, but I think that the Harry-Draco set up here is showing us what Harry will lose (reject and be rejected by) when he learns the truth of his past: we may be being set up to say, "Alas! If only he could still be friends with Draco! If only he'd been able to persuade Draco to re-evaluate things, too!" It could be that Draco and other Slytherin kids will turn with Harry against the LP when he learns that Voldemort murdered his parents, but what I'm seeing so far is a Draco who will be bound up by wounded family honour, pure-blood ideology, and Slytherin chauvinism. (I expect him to align with Theodore against Harry when Draco feels Harry has betrayed their friendship. Maybe Pansy will still be free-thinking enough to stand with Harry.)

The game may be letting us see a small idyll here in the first year of the game while these kids are young enough and the political situation is stable enough to allow cross-House and cross-party connections. While it's still possible for young brains to formulate questions and learn to keep them quiet/alive. I expect that we will spend a lot of time later on saying, "Do you remember when they all played chess together?" "Do you remember when Draco and Harry and Neville and Ron ALL explored the castle together?" "Isn't it a shame..."