Complete T1-9, all unique maps, Guardians, and Shaper.
Shape T10, 11, 13, 14, and 15. Shape T12 if you find +2 map drops from T11 inconsistent.
If desired, complete maps that drop map specific items.
Regarding Shaped T10-15, not much has changed.
T10. Mesa, Dunes, Primordial Pool. PP if you can stand the layout. It's still the best for sextants.
T11. Racecourse. The new Strand. Linear and Triple Boss.
T12. Player choice. Only for getting T13s more easily.
T13. Shore. Nothing has changed from what I can tell.
T14. Reef. Promenade got the Strand treatment. Reef is the most breach friendly map, imo.
T15. Player choice. Courtyard is Triple Boss and Underground River is mostly linear.