Come on guys, people are aware of the dangers of spoiling and they should be responsible for their actions. We can take measures so that one is not spoiled by accident, but apart from that, I believe that the wiki could (should?) be an extensive documentation of *everything* there is to document about the game. Besides, I doubt that there will be any major plot twists (a la Game of Thrones), due to the minimal dialogues & character cast of the game. So, that only leaves visual spoilers, which can be easily avoided/hidden.
For instance, we could "tag" wiki-articles and wiki-sections at two or three "spoiler levels": (a) spoiler free, (b) mild spoilers, e.g. related to equipment functions, enemy types and abilities, (c) heavy spoilers like how-tos, maps, boss strategies etc.