This game needs much background information, depending on the class, ship and map you play. So if you thought about implementing those tips in the loading screen (instead of putting a small minimap and a description as well as lore there), you'd have to implement really, really much.
This can be done by either putting much informiation in each loading screen, which the players that skipped tutorial and game manual probably won't read as well, or by putting less information in there a) with lore, minimap and map objective or b) without lore, minimap or map objective. This would either take much time to learn the game by only that in b) or just be too much information in a).