And if Scotty invented transwarp beaming then why didn't Picard know about it?
Come to think of it why didn't PrimeSpock use transwarp to transport himself to Romulan space with the red matter to save Romulus? You bastard Prime Spock. No wonder Nero hates you :shakes walking stick in the air:
OK maybe there's some limitation on it. Or maybe Scotty showed Spock the formula but didn't actually build the transporter. But if Khan did, then no doubt Spock could.