I have been playing X-Wing since wave 2 back when swarms were the big boys on the block. Up through wave 4 lower pilot skill was very common and was mostly the norm. The Han Shoots First lists were about the only high pilot skill lists that saw much success. Many rebel lists capped at skill 5 due to Biggs being a linchpin. I flew many variations of the swarm and came to realize that low pilot skill had in my opinion two advantages that were many times equal too or better then moving last and shooting first for high skill ships.
Blocking is huge, HUGE! PS 1 ships are kings at this obiously and the empire gets the best two , the tie fighter and the shuttle. The tie has a great dial and can be swarmed cheaply to block many lanes. The Best blocker IMO is the shuttle. With its huge base and ability to 0 move it can wreck your opponents moves at times for successive turns. I could not possibly remember how many times I have seen an undamaged ship get blocked and that causes its death. Soontir is the perfect example of a ship that dies the second it gets blocked.
The other factor that I really appreciate is shooting last gives a nice advantage on defense. Focus is very much the best all 'round choice for actions, when in doubt focus. As a mostly imperial player focus is very good for three agility ships on defense. I like the freedom to see what damage my opponent is going to deal and getting to decide when to spend that focus. When I shoot first I seem to always use my focus and so do my opponents leaving defense up to the dice. To me this makes it more of a chess game with my opponent.
I know that the Phantom scared the crap out of people when it was spoiled and it has caused a huge shift in PS bids but I still find myself finding success with running one higher skill pilot flanked with scrubs or a total scrub squad. I play a guy very regularly and he loves to fly ace squads so I have had tons of practice against high PS squads. It just seems lately that anyone from PS 6+ is loaded out with VI on these forums. I think there are so many good EPT's now that I find that a very precious slot to be used for a PS bid that doesn't always make sense. Anyone else out there have a fondness for scrubs?