I encountered this situation last battle:
We played 150 pts each side, my friend and me played 75 pts each vs. two Imperials. We had 2 Y-Wings and 4 X-Wings vs. 6 TIEs and 3 TIE-Adv. (I let out the exact lists as they don't matter here much).
Our force was in a dense dogfight with the TIEs (the Adv. were quite far away on the other side of the board) as it happened. In two consecutive rounds the TIEs with piloting skill 1 moved in such a way, that they blocked with their sheer masses the space where I could fly to with my ships. So I were forced to bounce into a ship losing my actions and were unable to fire on the nearest TIEs. If I had been able to move first it would have been a great advantage because I had have the possibitity to do actions and deny them to the Imperials.
Of course firing first because of the higher skill was an advantage. In the end the Rebels won because of some lucky defending die rolls even without a focus action. But I came to the conclusion that moving first could often enough be an advantage rather than a disadvantage.
And if you take into account that the opponent will try to block in such a way that fact urges you to take up suboptimal positions which gives you a bad point to shoot from or do maneuvers which give you stress tokens limiting you even more.
What do you think?
P.S. I play the german version so please excuse me if I use some wrong keywords .