Should ins and outs have apostrophes?

Yes, "ins" and "outs" can have apostrophes when used as shorthand for "ins and outs," indicating possession or a specific context. For example, "the ins' and outs' of the project" refers to the details belonging to those aspects. However, in informal contexts, they can also be used without apostrophes, especially when the meaning is clear. Ultimately, the choice depends on the desired formality and clarity of the writing.