Pole sleeves are designed for poles by being a loop which pushes the pool to a spot, so reduces the pole from moving significantly, so reduces wear, however a flat flysheet expanse which lets a pole move across the flysheet so increasing wear.
Struggle with a warranty return for a fly worn by poles under the sheet as shown, is all I'm saying, just use poles outside on loops as per the original design.
The fabric is insulating so the baggier sleeves deliberate to allow air through when its warmer. I think that the medium has the about-right bagginess in the arms. I went large for length, longer sleeves are more useful either for walking arms-down without gloves or climbing arms-up and less riding over gloves.
An odd thought is entering my head after 2 weeks of Helki daily use... the fabric seems to less insulate in wind, as if the outer is less windproof? Compared to earlier Paramo. Imagination? As a test I swapped a few nights ago into a Montane Litespeed and it was warmer in wind than the Helki. Odd.
I agree pitzips are useful, I got them on 4 wet-weather tops and they just are silly for general bimpling about town situations so different tops for different situations. I prefer Quito for longer energetic adventures, I missed pitzips last weekend with some long bike rides and long walks, but not an issue for bimbling.