Sure it can. Think of it in quantum terms - ships aren't in reserves in a specific place, they're in a state of flux, and until you observe them, they aren't here or there. Only when you observe/create TFs do they solidify at any one place when the waveform collapses.
Another way to think of it is that mob centers represent the ability to organize ships to a place. But the actual organizing gets set up over many, many years. Those ships could be travelling for that long, or that short, etc.
Personally, I view it as a game mechanic that makes my life easier. I _hated_ organizing fleets in MoO and MoO2. It was one of the more annoying things that one can do. I like that within my empire, I can organize a massive response to an invasion within moments, but have a problem projecting that force elsewhere.
Now, if only the AI would force me to do some of that.