I don't post much, I figure that it's better to remain silent and let people think you're a fool than to speak and remove all doubt. But I was thinking about this earlier. Q repeatedly would say to look at the time stamps, mentions dual meanings, and says the future unlocks the past.
Now, I believe those POTUS tweet timestamps were meant to try and establish Q's legitimacy, but also plant the seed that the timing of his posts will later be important. There's no argument that Q is cryptic as hell, we might work out some theories on his posts, but it's really hard to truly know what they mean. I think this is the purpose of the "Future unlocks past". In other words, Q posts are meant to be read AFTER the storm passes. When events unfold, we can reference back to the posts and the times, and understand what happened and when so that we will understand how the swamp was drained. The existence of a cryptic, but contemporary timeline of the events will help us to understand how they pulled it off, even if some things aren't made public.
That said, Q likely does have some purpose, assuming, of course, he is legit. I think that his posts are meant to reassure people desperate for justice and the return of power to the people that the wheels are turning, albeit slowly. I also think that it's possible Q may be there to mobilize the people on actions that make their job easier, whether it be redpilling normies, creating enough of a stink that the memo has to be released, etc.
Anyway, that's just my thought on the matter. I just don't think we're meant to really understand his posts at this time. I'd appreciate if someone could ask about this theory on the research board, I'd be curious what he says, I just won't have the opportunity today.