Sonequa Martin-Green added in her interview with LA Times that in Season 1 and 2 of Star Trek: Discovery, the rules were different.
The CBS All Access series was tasked with forging new ground while staying within the limits of existing canon and honoring it.
Season 3 is different in that the balance is the characters are familiar with the time they are from, but have been launched into a future where things happened the audience is aware of but not necessarily the Discovery crew.