If he is flushing the line, there is no blockage in the line. Yes, could be the screw is bottomed out. If you can blow thru the bottom of the head and air goes thru, and water comes out the pop up with the head off, then you are closing the head adjustment when you tighten it on the pop up.
I can't even estimate how many thousands of heads I have repaired, checked and adjusted over the years... but for sure, there is no reason to discard the filter. Many reasons to keep it there. It also doesn't reason that multiple companies are manufacturing all those heads, selling as cheap as possible, yet adding a filter you need to throw away to make the nozzle work better.
Same people telling me to throw them away also tell me rain gauges don't work.
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